If the coefficients of x2 and x3 in the expansion of (3 + ax)9 be same, then the value of a is
3/7
7/3
7/9
9/7
If p and q be positive , then the coefficient of xp and xq in the expansion of ( 1 + x ) p+q will be
Equal
Equal in magnitude but opposite in sign
Reciprocal to each other.
None of the above
If , then n + r is equal to
8
10
12
9
32n + 2 - 8n - 9 is divisible by
63
64
65
None of these
The number of terms in the expansion (a + b + c)n will be
n + 1
n + 3
None of those
Last two digit of the natural number
19
29
39
81
If in the expansion of (1 + x )n , the coefficient of rth and (r + 2)th term be equal , then r is equal to
2 n
n/2
The number of terms in the expansion (2 x - 3 y)5 is
5
6
30
The coefficient of rth and (r + 4)th terms are equal in the expansion of (1 + x)20 then the value of r will be
7
The remainder when 22006 + 2007 is divided by 17 is
11
13
14