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in a 10-item math test,how many ways can you select 5 problems to solve​

Sagot :

Using the formula n!/r!(n-r)! /n=10 and r=5

We have 10!/5!(10-5)!

=10!/5!(5!)

=10*9*8*7*6/5*4*3*2*1

=30,240/120

=252 ways

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