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seven boys were to have their pictures taken three at a time. the photographer had three chairs placed in a row. how many ways could the photographer arrange the boys for their pictures

Sagot :

AL2006

Any one of the 7 boys could be in the first chair.  For each of those . . .

Any one of the remaining 6 boys could be in the 2nd chair.  For each of those . . .
Any one of the remaining 5 boys could be in the third chair.

Total possible ways to set up 3 out of 7 boys for a picture = (7x 6 x 5) = 210 .


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