If the fourth term in the binomial expansion of ( 2 x + x log 8 x ) 6 ( x 0 ) is 20 × 8 7 , then a value of x is

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Solution

Q.
If the fourth term in the binomial expansion of ${(\frac{2}{x} + x^{\log_{8} x})}^{6}$ $(x > 0)$ is $20 \times 8^{7}$ , then a value of $x$ is

1 $8$

2 $8^{- 2}$

3 $8^{3}$

4 $8^{2}$

Ans.
(4)

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