/
1
0
2
None of these
Once I had been to the post-office to buy stamps of five rupees, two rupees and one rupee. I paid the clerk Rs.20, and since he did not have change, he gave me three more stamps of one rupee. If the number of stamps of each type that I had ordered initially was more than one, what was the total number of stamps that I bought.
10
9
12
8
/
a<0, b<0
a>0, b>0
a>0, b<0,¦a¦<¦b¦
a>0, b<0,¦a¦>¦b¦
A five-digit number is formed using digits 1, 3, 5, 7 and 9 without repeating any one of them. What is the sum of all such possible numbers?
6666600
6666660
6666666
None of them
Five-digit numbers are formed using only 0, 1, 2, 3, 4 exactly once. What is the difference between the greatest and smallest number can be formed?
19800
41976
32976
None of these
Three labelled boxes containing red and white cricket balls are all mislabelled. It is known that one of the boxes contain only white balls and only red balls. The third contains a mixture of red and white balls. You required to correctly lable the boxes with the lables red, white and red and white by picking a sample of one ball from only one box. What is the label on box you should sample?
White
Red
Red and white
Not possible to determine from a sample of one ball
For a scholarship, at the most n candidates of 2n+1 can be selected, if the number of different ways of selection of at least one candidate is 63, the maximum number of candidates that can be selected for the scholarship is
3
4
6
5
Ten points are marked on a straight line and 11 points are marked on another straight line. How many triangles can be constructed with vertices from among the above points?
495
550
1045
2475
A, B, and C are three cities. Each of these cities is connected with the other two cities by at least one direct road. If traveller wants to go from one city to another city, she can do so either by traverising a road connecting the two cities directly, or by traverising two roads, the first connecting the origin to the third city and the second connecting the third city to the destination. In all, there are 33 routes from A to B (including those via C). Similarly, there are 23 routes from B to C (including those via A). How many roads are there from A to C?
6
3
5
10
One red flag, three white and two blue flags are arranged in a line such that
I. No two adjacent flags are of the same colour.
II. The flags at the two ends of the line are of different colours.
In how many different ways can the flags be arranged?
6
4
10
2
/
9
10
11
None of these
How many numbers can be made with digits 0, 7, 8 which are greater than 0 and less than a million?
496
486
1084
728
In how many ways is it possible to choose a white square and a black square on a chess-board so that the squares must not lie in the same row or column?
56
896
60
768
Each of the 11 letters A, H, I, M, O, T, U, V, W, X and Z appears same when looked at in a mirror. They are called symmetric letters. Other letters in the alphabet are asymmetric letters.
How many four-letter computer passwords can be formed using only the symmetric letters (no repetition allowed)?
7920
330
146.40
419430
139 persons have signed for a elimination tournament. All players are to be paired up for the first round, but because 139n is an odd number one player gets a bye, which permotes him to the second round, without actually playing in the first round. The pairing continues on the next round, with a bye to any player left over. If the shedule is planned so that a minimum number of matches is required to determine the champion, the number of matches which must be played is:
136
137
138
139