In a party , 12 persons are to be arranged in a round table. If two particular persons are not to sit side by side, then the total no. of arrangements is
9 x 10!
2 x 10!
45 x 8!
10!
How many three -letter words can be formed from the alphabets a, b, c, d and e, if repetition is not allowed?
5
25
60
100
If 2nP3= 2. nP4, then the values of n is
4,5
6,10
1,8
2,4
How many different nine digit numbers can be formed from the number 223355888 by rearranging its digits in such a way that the odd digits occupy even positions?
16
36
180
How many numbers between 400 and 1000 can be formed with digits 0,2,3,4,5 and 6, if no digit is repeated in the same number?
120
240
300
The no. of words that can be formed out of the letters of the word ARTICLE, so that the vowels occupy even places, is
574
754
144
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
In how many ways 6 persons can stand in a queue at a time?
480
720
A room has 6 doors. The no. of ways, in which a man can enter the room through one door and come out through a different door, is
6
12
30
