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 sum of the coefficient in the expansion of (1+x - 3 x2)2163 will be
0
1
-1
22163
is equal to.
100
120
-120
None of these
The number of terms in the expansion (a + b + c)n will be
n + 1
n + 3
In the expansion of , the term containing x4 is
70 x4
60 x4
56 x4
If n is even , then the middle term in the expansion of is 924 x 6 , then n is equal to
10
12
14
If the ratio of the coefficient of third and fourth term in the expansion of (x - 1/2 x )n is 1 : 2 , then the value of n will be
18
16
-10
nc0 - 1/2 nc1 + 1/3 nc2 - ........ + (-1)n is equal to
1/(n + 1)
1/n - 1
The value of (0.99)15 is
0.8432
0.8601
0.8502
If (1 + a x)n = 1 + 8 x + 24 x2 + ........ then the value of a and n is
2, 4
2, 3
3, 6
1, 2