JEE MATHEMATICS MCQ: BINOMIAL THEOREM

1 Easy

1 of 1

Analyzing +4 | -1

If the magnitude of the coefficient of

{x^7}

in the expansion of

{\left( {{x^2} + \frac{1}{{bx}}} \right)^8}

,where

a,b

,are positive numbers,is equal to the magnitude of the
coefficient of

{x^{ - 7}}

in the of

{\left( {ax - \frac{1}{{b{x^2}}}} \right)^8}

,then

a

,and

b

are connected by the relation

View answer and explanation

Correct option: A

ab = 1

The correct answer is A (

ab = 1

) because equating the magnitudes of the coefficients of

x^7

and

x^{-7}

leads to the relation

ab = 1

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