In how many ways can 4 boys and 3 girls be seated in a row of 7 chairs, if the boys and girls have to sit alternate?
80
120
144
288
Seven athletes are participating in a race. In how many ways the first three prizes can be won?
220
210
200
180
A father with 8 children take 3 at a time to a zoological garden. If the father without taking the same 3 children more than once, then the no. of times he will go to the garden is
336
112
56
28
The no. of way in which the letters of the word 'ARRANGE' can be arranged such that both 'R' do not come together is
360
900
1260
1620
How many ways are there to arrange the letters in the word 'GARDEN' with vowels in alphabetical order?
240
480
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)
How many no. of 6 digits can be formed from the digits of the number 112233?
30
60
90
If 2nP3= 2. nP4, then the values of n is
4,5
6,10
1,8
2,4
The no. of ways in which 6 men and 5 women can dine on a round table' if not two women are to sit together, is
5! x 5!
5! x 4!
7! x 5!
The no. of diagonals of a polygon of n sides is
n (n-1)/2
n (n-2)/2
n(n-3)/2
n (n-5)/2