Find the sumof all numbers with two digits.

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

Find the sum of all 3-digit numbers which leave remainder 2, when divided by 5.

Find the sum of all two digit numbers which when divided by 4, yields 1 as remainder.

Find the sum of all the four digit numbers which are divisible by 29.

Find the sum of all five digit numbers ,that can be formed using the digits 1, 2, 3, 4 and 5 (repetition of digits not allowed)

Find the total number of 9-digit numbers which have all different digits.

Find the number of all whole numbers formed on the screen of a calculator which can be recognised as numbers with (unique) correct digits when they are read inverted. The greatest number formed onn its screen is 999999.

Find the number of n digit numbers, which contain the digits 2 and 7, but not the digits 0, 1, 8, 9.