There are 720 permutations of the digits 1, 2, 3, 4, 5, 6. Suppose these permutations are arranged from smallest to largest numerical values, beginning from 1 2 3 4 5 6 and ending with 6 5 4 3 2 1 Then the digit in unit place of number at 267Tth position is ________ .
Number of numbers beginning with
1 |
Number of numbers beginning with
2 |
Starting with 31 ………………………………
3 | 1 |
Starting with 3214 …………………………….
3 | 2 | 1 | 4 |
Finally
3 | 2 | 1 | 5 | 4 | 6 |
Hence, unit place digit of 267th number is 6.