Mensa test question -- how smart are you?
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An urn contains 75 red balls, 150 green balls.
You take out two balls without looking.
Case 1) You get both green balls : You throw away (outisde) one and put
back the other(in the urn)
Case 2) You get one green and one red ball: you throw away the green
and put back the red one.
Case 3) You get both red balls: you throw away both and put a green
ball from outside in the urn.
You repeat this until 1 ball is left.
Question : What is the color of the last ball in the urn?
Assumption: there are infinite green balls outside.
Hope you enjoy it..
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isn't this a probability qn?
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so what's ur answer? correct or not? then u tink u r smart oledi if u can answer it?
i.c.y -
You go gamefaqs....?
Answer is Red: Reason, at any one time, only odd number of red balls remaining. final ball must be red. Green balls can screw themselves.... -
Maybe.. not sure.. could be.. possible.. so what's your answer?Originally posted by shinta:isn't this a probability qn? -
red...it has to beOriginally posted by caramon:Maybe.. not sure.. could be.. possible.. so what's your answer? -
Question 2 :
If you are in a dark room with a candle, a wood stove and a gas lamp. You
only have one match, so what do you light first? -
Question 3 :
Three people check into a hotel. They pay £30 to the manager and go to their room. The manager suddenly remembers that the room rate is £25 and gives £5 to the bellboy to return to the people.
On the way to the room the bellboy reasons that £5 would be difficult to share among three people so he pockets £2 and gives £1 to each person.
Now each person paid £10 and got back £1. So they paid £9 each, totalling £27. The bellboy has £2, totalling £29. Where is the missing £1? -
Question 4 :
A customer at a 7-11 store selected four items to buy, and was told that the cost was $7.11. He was curious that the cost was the same as the store name, so he enquired as to how the figure was derived.
The clerk said that he had simply multiplied the prices of the four individual items. The customer protested that the four prices should have been ADDED, not MULTIPLIED.
The clerk said that that was OK with him, but, the result was still the same: exactly $7.11. What were the four prices? -
They only took off 0-2 red balls, so the answer is red as it is an odd number. correct or not?
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Question 5 :
Who is your father's only son's brother's uncle's wife's daughter's brother's father's son? -
Saw this one before in brainteasers! the matchOriginally posted by caramon:Question 2 :
If you are in a dark room with a candle, a wood stove and a gas lamp. You
only have one match, so what do you light first? -
You the man.. give that man a tiger..Originally posted by Oyster Omelette:Saw this one before in brainteasers! the match 
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I saw this one before also..no-one..but I forgot, why..haha, we do visit the same places, are weOriginally posted by caramon:Question 5 :
Who is your father's only son's brother's uncle's wife's daughter's brother's father's son?
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yep, it's probability, cause I saw that in my O level exam paperOriginally posted by caramon:Maybe.. not sure.. could be.. possible.. so what's your answer? 
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caramon tua kang about the SMSA licence, not knowing that I have one. Well guess what, I was a mensa member for a period of time too, and I can tell u these are NOT mensa Qs. tua kang again.
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The match. K1 question.Originally posted by caramon:Question 2 :
If you are in a dark room with a candle, a wood stove and a gas lamp. You
only have one match, so what do you light first? -
There is no missing money. The 3 stooges paid £27 and the bell boy got £2. The room charge is £27-£2=£25 which is what the manager got.Originally posted by caramon:Question 3 :
Three people check into a hotel. They pay £30 to the manager and go to their room. The manager suddenly remembers that the room rate is £25 and gives £5 to the bellboy to return to the people.
On the way to the room the bellboy reasons that £5 would be difficult to share among three people so he pockets £2 and gives £1 to each person.
Now each person paid £10 and got back £1. So they paid £9 each, totalling £27. The bellboy has £2, totalling £29. Where is the missing £1?
Don't be stupid, testing us with K1 question again. The problem lies in your analysis and the backwards calculation. -
is there something wrong with the question??Originally posted by caramon:Question 5 :
Who is your father's only son's brother's uncle's wife's daughter's brother's father's son?
"your father's only son's brother's "
if the father only have 1 son, how in the world can the only son have a brother? -
The matchOriginally posted by caramon:Question 3 :
Three people check into a hotel. They pay £30 to the manager and go to their room. The manager suddenly remembers that the room rate is £25 and gives £5 to the bellboy to return to the people.
On the way to the room the bellboy reasons that £5 would be difficult to share among three people so he pockets £2 and gives £1 to each person.
Now each person paid £10 and got back £1. So they paid £9 each, totalling £27. The bellboy has £2, totalling £29. Where is the missing £1? -
The bastard, Caramon.Originally posted by caramon:Question 5 :
Who is your father's only son's brother's uncle's wife's daughter's brother's father's son? -
i am waiting for someone to solve this. interesting question, but too bad brain rusty liaoz cannot think.Originally posted by caramon:Question 4 :
A customer at a 7-11 store selected four items to buy, and was told that the cost was $7.11. He was curious that the cost was the same as the store name, so he enquired as to how the figure was derived.
The clerk said that he had simply multiplied the prices of the four individual items. The customer protested that the four prices should have been ADDED, not MULTIPLIED.
The clerk said that that was OK with him, but, the result was still the same: exactly $7.11. What were the four prices? -
$0.80, $1.70, $2.01, $2.60Originally posted by caramon:Question 4 :
A customer at a 7-11 store selected four items to buy, and was told that the cost was $7.11. He was curious that the cost was the same as the store name, so he enquired as to how the figure was derived.
The clerk said that he had simply multiplied the prices of the four individual items. The customer protested that the four prices should have been ADDED, not MULTIPLIED.
The clerk said that that was OK with him, but, the result was still the same: exactly $7.11. What were the four prices?
$0.80*$1.70*$2.01*$2.60 = $7.107, round off to the nearest cents.
$0.80+$1.70+$2.01+$2.60 = $7.11 -
Geez, probability!! My fav, but i'm a lil too lazy to think. MMMM Probability!
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yoz care to share ur working?Originally posted by shadowlunar:$0.80, $1.70, $2.01, $2.60
$0.80*$1.70*$2.01*$2.60 = $7.107, round off to the nearest cents.
$0.80+$1.70+$2.01+$2.60 = $7.11