Question
If the coefficients of rth, (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
-
m2 – m(4r – 1) + 4r2 – 2 = 0
-
m2 – m(4r+1) + 4r2 + 2 = 0
-
m2 – m(4r + 1) + 4r2 – 2 = 0
-
m2 – m(4r – 1) + 4r2 + 2 = 0
Solution
C.
m2 – m(4r + 1) + 4r2 – 2 = 0
