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+1 vote
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in Binomial Theorem by (51.3k points)
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The coefficient of x5 in the expansion of (1 + x)21 + (1 + x)22 +.........+ (1 + x)30 is

(a) 31C521C5

(b) 31C621C6

(c) 30C620C6

(d) None of these

1 Answer

+1 vote
by (51.0k points)
selected by
 
Best answer

Correct option is (b) 31C621C6

Co-efficient of x5 in (1 + x)21 + (1 + x)22 +............ + (1 + x)30

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