A) 7
B) 8
C) 9
D) \[{{6}^{10}}\]
Correct Answer: B
Solution :
[b] No. of terms in the expansion \[{{=}^{n+3-1}}{{C}_{3-1}}\] \[\therefore \,\,\,{{\,}^{n+2}}{{C}_{2}}=45\Rightarrow n=8\]
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