252 can be expressed as a product of primes as ;

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1

252 can be expressed as a product of primes as ;

2

A number a is said to be perfect if the sum of all its divisors (excluding n itself) is equal to n. An example of perfect number is :

3

Which of the following is a pair of co-primes ?

4

The L.C.M. of 22, 54, 108, 135 and 198 is :

5

Three numbers are in the ratio 1:2:3 and their H.C.F. is 12. The numbers are :

6

The sum of two numbers is 528 and their H .C.F. is 33. The number of pairs of numbers satisfying the above conditions is :

7

The H.C.F. of two numbers is 11 and their L.C.M. is 7700. If one or the numbers is 275, then the other is :

8

The LCM of two numbers is 45 times their HCF. If one of the numbers is 125 and the sum of HCF and LCM is 1150, the other number is :

9

Product, of two co-prime numbers is 117. Their L.C.M. should be :

10

The H.C.F. of two numbers is 23 and the other two factors of their L.C.M. are 13 and 14. The larger of the two numbers is :

11

Three different containers contain 496 litres, 403 litres and 713 litres of mixtures of milk and water respectively. What biggest measure can measure all the different quantities exactly ?

12

The least number of five digits which is exactly divisible by 12, 15 and 18, is :

13

The smallest number which when diminished by 7, is divisible by 12, 16, 18 and 21 ?.

14

Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?

15

A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting noint ?

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