How many ways can an IRS auditor select 3 of 9 tax returns for an audit?
1 answer:
Answer:
84ways
Step-by-step explanation:
This is a problem on combination. Combination has to do with selection. For example if r objects are to be selected from a pool of n objects, this can be done in nCr ways.
nCr = n!/(n-r)!r!
9C3= 9!/(9-3)!3!
9C3= 9!/(6)!3*2*1
9C3= 9*8*7*6!/(6)!6
9C3= 9*8*7*/6
9C3= 9*8*7*/6
9C3= 504/6
9C3= 84ways
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Uhhh, it can be factored into 3 * ( 3r - 1 )
Step-by-step explanation:
I think you know how factoring works. Other than that, I see no way fo proving that it can't be factored.
