How many numbers of two digits are divisible by 6 ?

How many number of two digits are divisible by 7 ?

Find the sum of all odd numbers of four digits which are divisible by 9.

How many two-digit numbers are divisible by 3?

How many numbers of four digits can be formed by using the digits 1, 3, 5, 7, 9, a digit being repeated any number of times in any number ?

How many three-digits numbers are divisible by 7 ?

How many of them are divisible by 10 if 6 digit numbers formed by 0,1,3,5,7,9 when no digit repeated?

How many numbers between 99 to 999 which are divisible by 11.

Given below are two pairs of statements. Combine these two statements using if and only if : p : If the sum of digits of a number is divisible by 3, then the number is divisible by 3. q : If a number is divisible by 3, then the sum of its digits is divisible by 3.