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If the coefficients of mth, (m+1) the an...

If the coefficients of mth, `(m+1)` the and `(m+2)th` terms in the expansion `(1+x)^n` are in A.P., then (A) `n^2+n(4m+1)+4m^2+2=0` (B) `(n+2m)^2=n+2` (C) `(n-2m)^2=n+2` (D) `n^2+4(4m+1)+nm^2-2=0`

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