Find the number of divisors of 720.

Find the number of divisors of the number N=2^3 .3^5 .5^7 .7^9 which are perfect squares.

Let N be the number of points (x, y, z) in space such that x+y+z=12 , where x, y, z in N . The number of divisors of N is equal to

The number of divisors of any prime number is …….

The total number of divisor of 480 that are of the form 4n+2,ngeq0, is equal to a. 2 b. 3 c. 4 d. none of these

If 10! =2^p .3^q .5^r .7^s , then (A) 2q = p (B) pqrs = 64 (C) number of divisors of 10! is 280 (D) number of ways of putting 10! as a product of two natural numbers is 135

25% of the students in a school are girls and others are boys. Form an equation and draw a graph for this. By observing the graph, answer the following : (i) Find the number of boys, if the number of girls is 25. (ii) Find the number of girls, if the number of boys is 45. (iii) Take three different values for number of boys and find the number of girls. Similarly take three different values for number of girls and find the number of boys?

For number N=35700, find (i) number of divisors (ii) number of proper divisors (iii) number of even divisors (iv) number of odd divisors (v) sum of all divisors

Find the number of odd proper divisors of 3^pxx6^mxx21^ndot

A positive integer n is of the form n=2^(alpha)3^(beta) , where alpha ge 1 , beta ge 1 . If n has 12 positive divisors and 2n has 15 positive divisors, then the number of positive divisors of 3n is

Write the following sets in Roster form. C = {x : x is a prime number and a divisor of 6 }