Where does n feature???

Level pending

In the expansion of ( a + b ) n (a+b)^n , which of the following characteristics is equal to n n ?

The sum of the coefficients None of these The total number of terms The sum of the powers of a and b in each term

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1 solution

Noel Lo
Apr 21, 2015

The sum of the coefficients = 2 n 2^n and there are ( n + 1 ) (n+1) terms in the expansion, NOT n n .

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