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QJEEM21Macfa1: JEE Main 2021 Mathematics - Class 11 JEEM21Macfa1 Solution: The ratio of the coefficient of the middle term in the…

The ratio of the coefficient of the middle term in the expansion of (1 + x)20 and the sum of the coefficients of two middle terms in expansion of (1 + x)19 is _____________.

Step-by-Step Verified Solution

Coeff. of middle term in (1 + x)20 = 20C10 & Sum of coeff. of two middle terms in (1 + x)19 = 19C9 + 19C10

So required ratio = 20C1019C9+19C10=20C1020C10=1

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