What is the sum of all natural numbers between 100 and 400 which are divisible by 13? 

How many three-digit numbers are there in which all the digits are odd? 

The difference of a number consisting of two digits from the number formed by inter changing the digits is always divisible by: 

The greatest number less than 1500, which is divisible by both 16 and 18, is:

For what value of m will the system of equations 17x+my+102=0 and 23x+299y+138=0 have infinite number of solutions? 

The number of integers in between 100 and 600, which are divisible by 4 and 6 both, is: 

What least value which should be added to 1812 to make it divisible 7,11 and 14? 

What least value must be assigned to ‘*’ so that the number 63576 * 2 is divisible by 8?