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  • If the binomial coefficients of <img alt="(2 r+4)^{\text {th }},(r-2)^{\text {th }}" src="https://entrancecorner.oncodecogs.com/gif.latex?%282%20r&plus;4%29%

If the binomial coefficients of (2 r+4)^{\text {th }},(r-2)^{\text {th }} term in the expansion of (a+b x)^{18} are equal find r

Option: 1

r=5


Option: 2

r=6


Option: 3

r=7


Option: 4

r=8


Answers (1)

best_answer

This is possible only when

either 2 r+3=r-3       --------------(1)

or  2 r+3+r-3=18  --------------(2)

from (1) r=-6 not possible but from (2) r=6

Hence r=6 is the only solution

Posted by

Irshad Anwar

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