Given positive integers r> 1,n>2 and that the coefficient of (3r)th (r + 2)th terms in the binomial expansion of (1+x)2n are equal. Then
n= 2x
n =2r+1
n= 3r
None of these
If in the expansion of (1+x)m (1-x)n, the coefficinents of x and x2 are 3 and-6 respectively, the m is
6
9
12
24
____.
n
1/n
The value of is ____.
– 198
198
99
– 99
The coefficient of in the expansion of is ____.
30
60
40
None of the above
If the coefficient of x in the expansion of is 270, then k = ____.
1
2
3
4
The coefficients of three successive terms in the expansion of are 165, 330 and 462 respectively, then the value of n is ____.
11
10
12
8
The term independent of y in the expansion of is ____.
84
8.4
0.84
– 84