In how many ways can one write the numbers 1, 2, 3, 4, 5, and 6 in a row so that given any number in the row, all of its divisor
s (not including itself) appear to its left
1 answer:
Answer: 25 ways.
Step-by-step explanation:
first we have 1,2,6. this can appear once.
4, can appear in twice.
- 3 can appear in-between 2 and 6, this means 3 can appear 3times before 6.
- 5 would appear 5 times.
- after 6 3 can appear 2 more times.

by not including itself, an appearing on the left side. one number can be written 25ways
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