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Question

Prove that the ratio of the coefficient of x10 in (1x2)10 and the term independent of x in (x2x)10 is 1 : 32.

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Solution

Coefficient of x10 i.e.,(x2)5 will be in the 6th term =10C5.
The term independent of x in the 2nd binomial will be 6th term = 2510C5.
Hence their ratio is 1 : 2^5 or 1 : 32.

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