1.

If the coefficients of r^(th),(r + 1)^(th) and (r + 2)^(th) terms in the binomial expansion of (1 + y)^(m) are in A.P., then m and r satisfy the equation

Answer»

1. `m^(2) - m(4r - 1) + 4r^(2) + 2 = 0`
2. `m^(2) - m(4r + 1) + 4r^(2) - 2 = 0`
3. `m^(2) - m(4r + 1) + 4r^(2) + 2 = 0`
4. `m^(2) - m(4r - 1) + 4r^(2) - 2 = 0`

ANSWER :B


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