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Question

Question: If it is known that the third term of the binomial expansion \(\left( x + x^{\log_{10}x} \right)^{5}...

If it is known that the third term of the binomial expansion (x+xlog10x)5\left( x + x^{\log_{10}x} \right)^{5}is 106 then x is equal to-

A

10

B

10–5/2

C

100

D

5

Answer

10

Explanation

Solution

In (x+xlog10x)5(x + x^{\log_{10}x})^{5}3rd term is 106

Ž T3 = 5C2 (x)2[(x)log10x(x)^{\log_{10}x}]3 = 106

x2 ((x)3log10x(x)^{3\log_{10}x}) = 105

Ž x = 10