The sum of the rational terms in the expansion of is
41
32
18
9
9 balls are to be placed in 9 boxes and 5 of the balls cannot fit into 3 small boxes. The number of ways of arranging one ball in each of the boxes is
18720
18270
17280
12780
The number of different permutations of the word 'BANANA' is
6
36
30
60
How many words can be formed from the letters of the word DOGMATIC, if all the vowels remain together?
43
432
4140
4320
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 total number of terms in the expansion of (x+y)100 +(x-y)100 after simplification is
51
202
100
50
The ninth term of the expansion is
23n - 7n - 1 is divisible by
49
25
The coefficient of xn in the expansion of (1+2x+3x2 +...) is
0
-1
1
2
The number of positive odd divisors of 216 is
4
8
12
