Binomial TheoremHard

Question

If (1 + x + x2)25 = a0 + a1x + a2x2 + ..... + a50. x50 then a0 + a2 + a4 + ..... + a50 is -

Options

A.even
B.odd & of the form 3n
C.odd & of the form (3n - 1)
D.odd & of the form (3n + 1)

Solution

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