Question

How many different routes can a saleswoman have if she must visit nine different companies in a day?

Answer 1

362880

Explanation:

= 9!

= 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1

= 362880

Answer 2

This works out at 3,628,800 possible routes. Trying one route every day in a five-day working week for 50 working weeks, it takes 14,515 years to try them all.