(a) Let n be a nonnegative integer. Use the identity ^ to show that (1) (b) Prove (1) again by counting, in two different ways, the number of ways of choosing n people from a set of n girls and n boys.
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Originally Posted by shmounal (a) Let n be a nonnegative integer. Use the identity ^ to show that (1) Compare the coefficient of in both expressions above. Tonio (b) Prove (1) again by counting, in two different ways, the number of ways of choosing n people from a set of n girls and n boys. .
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