3rd grade math
posted by Daniel mom .
Please help not sure how to explain to my son. How should I set this up.
Sam has the same chores each week, but he wants to add variety. Suppose Sam has to empty trash, water the plants, fill the bird feeder, and sort the recycling. How many different ways can Sam complete his chores.

3rd grade math 
amy
5*4*3*2*1=120 ways

3rd grade math 
Pendergast
Sam has 4 chores to complete  he can choose the order. He has 4 choices for the first chore.
For each choice of the first, he can choose 1 of the 3 remaining for the second chore.
etc.
4*3*2*1 = 24
This is more generally known as the ordering problem  there are n! ways to order n objects.
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