JEE MATHEMATICS MCQ: BINOMIAL THEOREM

1 Easy

1 of 1

Application +4 | -1

If in the expansion of

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

, the coefficient of

r\,th

and

\left( {r + 2} \right)

th term be equal, then

r

is equal to

View answer and explanation

Correct option: C

\frac{n}{2}

Option C (

\frac{n}{2}

) is correct because if the coefficients of the r-th and (r+2)-th terms are equal, then

{\;^n}{C_{r - 1}} = {\;^n}{C_{r + 1}}

, leading to

r = \frac{n}{2}

More Questions from BINOMIAL THEOREM

Practice All Chapter MCQs →

\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