How many no. of 6 digits can be formed from the digits of the number 112233?
30
60
90
120
How many three -letter words can be formed from the alphabets a, b, c, d and e, if repetition is not allowed?
5
25
100
A polygon has 44 diagonals. The no. of its sides is
11
7
8
If repetition of numbers is allowed, then the no. of ways in which three even digit natural numbers can be formed is
250
350
450
550
If nCr, denotes the no. of combinations of n things taken r at a time, then the value of expression
nC(r+1) +rC(r-1)+ 2nCr is
(n+2)Cr
(n+2) C(r+1)
(n+1) Cr
(n+1) C(r+1)
An electrical device can be minor defective in 10 ways and major defective in 8 ways. In how many ways 2 major and 2 minor defects can occur?
5040
1260
164
80
In how many ways can 21 English and Hindi books be placed in a row, so that not two Hindi books are together?
1540
1450
1504
1405
Among the 36 teachers in a school, one principal and one vice principal are to be appointed. In how many ways this can be done?
1060
1160
1206
If a polygon has 10 sides, then the no. of diagonals of the polygon is
35
20
From a class of 6 students, 4 are to be chosen for a competition. In how many ways can this be done?
6
15
18
24
