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If (1-x^2)^n=sum(r=0)^n ar x^r(1-x)^(2n-...

If `(1-x^2)^n=sum_(r=0)^n a_r x^r(1-x)^(2n-r),t h e na_r` is equal to `^n C_r` b. `^n C_r3^r` c. `^2n C_r` d. `^n C_r2^r`

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