(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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- February 21st 2010, 05:54 PMshmounalDifferent ways of Counting ....
(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. - February 21st 2010, 06:47 PMtonio