JEE MATHEMATICS MCQ: BINOMIAL THEOREM

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Analyzing +4 | -1

The coefficient of the

(r+1)

th term of

\left(x+\frac{1}{x}\right)^{20}

when expanded in the descending powers of

x

, is equal to the coefficient of the 6 th term of

\left(x^2+2+\frac{1}{x^2}\right)^{10}

when expanded in ascending powers of

x

. The value of

r

View answer and explanation

Correct option: D

None of the above

Option A (5) is the closest to the correct value of r, which is derived by equating the coefficients of the binomial expansions and solving for r.

More Questions from BINOMIAL THEOREM

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\left({ }^{10} C_0\right)^2-\left({ }^{10} C_1\right)^2+\ldots-\left({ }^{10} C_9\right)^2+\left({ }^{10} C_{10}\right)^2

a

d

\left( {n + 1} \right)

a{C_0} - \left( {a + d} \right){C_1} + \left( {a + 2d} \right){C_2} - ... + ...

(1-x)^{201}\left(1+x+x^2\right)^{200}

\left(\frac{1}{x}+2 x\right)^n

{x^5}

\frac{{1 + {x^2}}}{{1 + x}},\left| x \right| < 1,

\left(\begin{array}{c}2 n+1 \\ 0\end{array}\right)+\left(\begin{array}{c}2 n+1 \\ 3\end{array}\right)+\left(\begin{array}{c}2 n+1 \\ 6\end{array}\right)+\ldots=170

n