Math miscellaneousHard

Question

If (1 - x + x2)n = a0 + a1x + a2x2 + ....... + a2nx2n, then a0 + a2 + a4 +........+ a2n is equal to:-

Options

A.(3n + 1)
B.(3n - 1)
C.(1 - 3n)
D. + 3n

Solution

(1 - x + x2)n = a0 + a1x + a2x2 +......... a2nx2n    ...(1)
put x = 1, -1 in eqn. (1) and add.
a0 + a2 + .......... =

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