Without using permutation,
4.16 / 1.1 = 3.78
4.1 / 1.1 = 3.72
No 1 decimal number only between 3.72 to 3.78, hence none of the permutations can include 1.1
4.16 / 1.2 = 3.467
4.1 / 1.2 = 3.4167
No 1 decimal number only between 3.4167 to 3.467, hence none of the permutations can include 1.1
4.16 / 1.3 = 3.2
4.1 / 1.3 = 3.154
So the only possibility here is 3.2 * 1.3
Originally posted by ndmmxiaomayi:
If you are free enough, you can permutate everything to find an answer.
3.1 * 1.3 - one possibility
3.1 * 1.3 = 4.03, it is out of the required range