Using all the digits 1,4,5,8,9 in how many ways can numbers be formed,so that the numbers would be even.

Using all the digits 1,4,5,8,9 in how many ways can numbers be formed,so that the numbers would be divisible by 5?

Using all the digits 1,4,5,8,9 in how many ways can numbers be formed,so that the numbers would be odd.

In how many ways can 10 scrips be arranged, so that the best and the worst do not come together?

In how many ways can one post 3 letters in 5 post boxes?

How many types of matrices can be formed from 8 elements ?

A group consists of 4 girls and 7 boys.Ion how many ways can a tean of 5 members be selected so that the team has at least one boy and one girl?

Form the equation from the folllowing: The sum of the digit number is 12 . If the position of thee two digitss are interchanged, th number so formed is smaller than the original number by 18 . Find the number.

Find the least number that is divisible by all the numbers between 1 and 8.

Form the pair of linear equations in the following problems,and find their solutions(if they exist) by the elimination method:(iii) The sum of the digits of a two-digit number is 9.Also nine times this number is twice the number obtained by reversing the order of the digits.Find the number.

In how many ways can 7 boys and 5 girls be arranged in a row so that no two girls come together?