If the fourth term in the expansion of $\left(a x+\frac{1}{x}\right)^n$ is $\frac{5}{2}$, then the value of ${a} \times {n}$ is

JEE MATHEMATICS MCQ: BINOMIAL THEOREM

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Application +4 | -1

If the fourth term in the expansion of

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

\frac{5}{2}

, then the value of

{a} \times {n}

View answer and explanation

Correct option: A

Option A (3) is correct because by equating the power of x to zero and using the given information about the fourth term, we can find the values of a and n, and their product is 3.

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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

equals If

a

and

d

are two complex numbers, then the sum to

\left( {n + 1} \right)

terms of the following series

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

is The number of different terms in the expansion of

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

is The sum of the coefficient of the binomial expansion of

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

is equal to 6561 . The constant term in the expansion is The coefficient of

{x^5}

in the expansion of

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

is If

\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

, then

n

equals