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if the coefficient of `(2r+1)`th term and `(r+2)`th term in the expansion of `(1+x)^(43)` are equal then r=?

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in Binomial Theorem by (74.9k points)
if the coefficient of `(2r+1)`th term and `(r+2)`th term in the expansion of `(1+x)^(43)` are equal then r=?
A. 14
B. 30
C. 41
D. 42
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Correct Answer - A
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