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Q.

If the coefficient of (3r+4)th term and (2r – 2)th term in the expansion of (1 + x)20 are equal then r is equal to :

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a

4

b

5

c

7

d

8

answer is A.

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Detailed Solution

20C3r+3=20C2r−3⇒(3r+3)+(2r−3)=20⇒r=4
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If the coefficient of (3r+4)th term and (2r – 2)th term in the expansion of (1 + x)20 are equal then r is equal to :