What is the number of five-digit numbers formed with 0, 1, 2, 3, 4 without any repetition of digits ?

The sum of all five digit numbers formed with the digits 1,2,3,4,5 without repetition of digits are

The number of five digit numbers formed with the digits 0, 1, 2, 3, 4 and 5 (without repetition) and divisible by 6 are

The number of five digit numbers formed with the digits 0, 1, 2, 3, 4 and 5 (without repetition) and divisible by 6 are

A five digit number is formed by the digits 1,2,3,4,5 without repetition.

How many two - digit numbers can be formed using 1,2,3,4,5 without repetition of digits ?