A) 202
B) 51
C) 50
D) None of these
Correct Answer: B
Solution :
We know \[\frac{1}{2}\left\{ {{(1+a)}^{n}}+{{(1-a)}^{n}} \right\}={{\,}^{n}}{{C}_{0}}+{{\,}^{n}}{{C}_{2}}{{a}^{2}}+{{\,}^{n}}{{C}_{4}}{{a}^{4}}+.....\] Therefore, number of terms in expansion of \[\{{{(x+a)}^{100}}+{{(x-a)}^{100}}\}\] is 51.
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