From the set `{2, 3, 4, 5, 6, 7, 8, 9}`, how many pairs of co-primes can be formed?

From the digits 2, 3, 4, 5, 6 and 7, how many 5-digit numbers can be formed that have distinct digits and are multiples of 12?

How many three-digit number can be generated from 1, 2, 3, 4, 5, 6, 7, 8, 9, such that the digits are in ascending order?

Answer the following: Write the set: A = { 1/2, 2/3, 3/4, 4/5, 6/7, 7/8, 8/9} in the set - builder form.

In how many ways 5 distinct numbers can be selected from the natural numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 such that atleast one of these 5 is greater than 8

Let A={1,2,3,4,5,6,7,8,9). How many subsets does A have which contain 4,5 and 6?

Five different digits from the setoff numbers {1,2,3,4,5,6,7} are written in random order. How many numbers can be formed using 5 different digits from set {1,2,3,4,5,6,7} if the number is divisible by 9?

Five different digits from the setoff numbers {1,2,3,4,5,6,7} are written in random order. How many numbers can be formed using 5 different digits from set {1,2,3,4,5,6,7} if the number is divisible by 9?