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OpenStudy (anonymous):
GUYSGUYGUYSThere are 22 students in Mario's class. Mario's teacher is planning to pair the students up for a project. How many different combinations of pairs are possible?
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ganeshie8 (ganeshie8):
you can choose two students from 22 students in 22*21 ways
ganeshie8 (ganeshie8):
but out of these 2! permutations form the same combination
ganeshie8 (ganeshie8):
so we divide 2!
ganeshie8 (ganeshie8):
(22 * 21) / 2!
OpenStudy (anonymous):
231?
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ganeshie8 (ganeshie8):
correct
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