A) 90
B) 84
C) 78
D) none of these
Correct Answer: B
Solution :
[ 9 cases] 0 0 0 0 0 0 0 0 0\[={}^{9}{{C}_{3}}=84\] or co-eff. of \[{{x}^{6}}\]in \[{{(1+x+{{x}^{2}}+{{x}^{3}}+{{x}^{4}}+{{x}^{5}}+{{x}^{6}})}^{4}}\] Treat W, B, G, R as begger]You need to login to perform this action.
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