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

Which of the following has most number of divisors ?

3

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 :

4

H.C.F. of 4 x 27 x 3125, 8 x y x 25 x 7 & 16 x 81 x 5 x 11 x 49 is :

5

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

6

The H.C.F. of 3666 and 3444 is :

7

The H.C.F. of 1.75, 5.6 and 7 is :

8

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

9

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

10

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 ?

11

Let N be the greatest number that will divide 1305, 4665 and 6905, leaving the same remainder in each case Then sum of the digits in N is :

12

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

13

The least number which is a perfect square and is divisible by each of the numbers 10, 20 and 24, is

14

Four different electronic devices make a beep after every 30 minutes, 1 hour, 1.5 hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at:

15

252 can be expressed as a product of primes as :

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