How many 10 digit numbers can be written by suing digits 9 and 2
10c1 + 9c2
210
10c2
10!
, then r is
5
4
3
2
The ninth term of the expansion is
The total number of terms in the expansion of (x+y)100 + (x-y)100 after simplification is
202
100
50
51
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 sum of the rational terms in the expansion of is
41
32
18
9
23n - 7n - 1 is divisible by
36
49
25
If the rth term in the expansion of contains x4 , then r is equal to
0
-3
The number of ways of distributing 8 identical balls in 3 distinct boxes, so that move of the boxes is empty, is
21
38
8C3
The number of different permutations of the word 'BANANA' is
6
30
60
