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If the binomial coefficient of the (2r+4...

If the binomial coefficient of the `(2r+4)^(th)` term and `(r-2)^(th)` term in the expansion of `(1+x)^(18)` are equal find the value of r.

Text Solution

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The coefficient of `(2r+4)^(th)`term in `(1+x)^18`= `"^18C_(r-3)` and the coefficient `"^18C_(2r+3)` =`"^18C_(r-3)`
2r+3+r-3=18
r=6
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