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If (1+x)^n=a0+a1x+a2x^2+....+anx^n, then...

If `(1+x)^n=a_0+a_1x+a_2x^2+....+a_nx^n`, then `(a_0-a_2+.....)^2+(a_1-a_3+.....)^2` is equal to (A)`3^n` (B) `2^n` (C)`((1-2^n)/(1+2^n))` (D) none of these

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