Math miscellaneousHard

Question

If (4x2 + 1)n = ar(1 + x2)n-rx2r, then the value of ar is -

Options

A.nCr-1.4r
B.nCr3r
C.nCr4r
D.nCr-13r

Solution

Given expression can be written as

∴ ar = nCr3r

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