The coefficient of x in the expansion of (1+x)(1+2x)(1+3x)...(1+100x) is
5050
10100
5151
4950
The number of different permutations of the word 'BANANA' is
6
36
30
60
, then r is
5
4
3
2
The sum of the digits in the unit place of all numbers formed with the help of 3,4,5,6 taken all at a time is
18
108
432
144
The sum of the rational terms in the expansion of is
41
32
9
How many 10 digit numbers can be written by suing digits 9 and 2
10c1 + 9c2
210
10c2
10!
If the rth term in the expansion of contains x4 , then r is equal to
0
-3
The coefficient of x-7 in the expansion of will be
The number of ways in which 5 boys and 5 girls can be seated for a photograph so that no two girls sit next to each other is
6!5!
(5!)2
23n - 7n - 1 is divisible by
64
49
25
