A) \[{{\,}^{60}}{{C}_{40}}\]
B) \[{{\,}^{30}}{{C}_{20}}\]
C) \[{{\,}^{15}}{{C}_{2}}\]
D) None of these
Correct Answer: A
Solution :
\[{{(1+3x+3{{x}^{2}}+{{x}^{3}})}^{20}}={{(1+x)}^{60}}\] \[\therefore \]Coefficient of \[{{x}^{20}}\]in \[{{(1+x)}^{60}}\]is \[{{\,}^{60}}{{C}_{20}}\]or \[{{\,}^{60}}{{C}_{40}}.\]You need to login to perform this action.
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