Binomial TheoremHard

Question

The number of values of ′r′ satisfying the equation, 39C3r-1 - 39Cr2 = 39Cr2-1 - 39C3r is

Options

A.1
B.2
C.3
D.4

Solution

39C3r-1 - 39Cr2 = 39Cr2-1 - 39C3r
r2  = 3r    or    r = 0, 3

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