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 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
The ninth term of the expansion is
, then r is
5
4
3
2
The number of positive odd divisors of 216 is
6
8
12
From 12 books, the difference between number of ways a selection of 5 books when one specified book is always excluded and one specified book is always included, is
64
118
132
330
The number of different permutations of the word 'BANANA' is
36
30
60
The coefficient of xn in the expansion of (1+2x+3x2 +...) is
0
-1
1
If the rth term in the expansion of contains x4 , then r is equal to
-3
The total number of terms in the expansion of (x+y)100 +(x-y)100 after simplification is
51
202
100
50
