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
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
The no. of ways of answering 5 objective type questions, when each question has 4 choices , is
5
16
256
1024
Seven athletes are participating in a race. In how many ways the first three prizes can be won?
220
210
200
180
How many no. of 6 digits can be formed from the digits of the number 112233?
30
60
90
120
There are 5 roads leading to a town from a village. The number of ways, in which a villager can go to the town and return back, is
25
20
10
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
If 2nP3= 2. nP4, then the values of n is
4,5
6,10
1,8
2,4
If 12Pr=11P6+6. 11P5, then the value of r is
3
9
12
How many ways are there to arrange the letters in the word 'GARDEN' with vowels in alphabetical order?
360
240
480
