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
r2 = 3r or r = 0, 3
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