How many different ways are there to select a group of 7 out of 9 people for a committee in which there are 7 distinct roles?

P(9,7) =  181440

Step-by-step explanation:

The roles are distinct so order matters. So we must use the permutation formula.

P(n,r)=n!/(n−r)!

P(9,7) = 9! / 2! = 9*8*7*6*5*4*3 = 181440

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

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step-by-step explanation:

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