If number of terms in the expansion of
(x−2y+3z)n are 45, then n =
7
8
9
None of these
(n+1)(n+2)2 = 45 or n2 + 3n - 88 = 0 ⇒ n = 8 ...
If number of terms in the expansion of (x−2y+3z)n are 45, then n =
If x4 occurs in the rth term in the expansion of (x4+1x3)15, then r =
In ( 3√2+13√3)n if the ratio of 7th term from the beginning to the 7th term from the end is 16, then n =