The natural number other than 1 which is not prime is ____ number.

If n is a natural number other than a perfect square then sqrtn is ____ number.

A=k^(2)-1andB=(k+1)^(2)-1 , where k is a natural number greater than 1. How many prime number are there by which both A and B are divisible for at least one value of k?

If A is the set of even natural numbers less than 8 and B is the set of prime numbers less than 7, then the number of relations from A to B is :

The smallest value of natural number n, for which 2n + 1 is not a prime number, is 3 (b) 4 (c) 5 (d) None of these

If A is the set of even natural numbers less than 8 and B in the set prime numbers less than 7, then the number of relations from A to B is

An integer is chosen from the first twenty natural number, the probability that it is a prime number is ……………….. .

An integer is chosen from the first twenty natural number, the probability that it is a prime number is ……………….. .

Let A= The set of all natural numbers less than 8, B=The set of all prime numbers less than 8, C= The set of even prime number. Verify that (AcapB)timesC=(AtimesC)cap(BtimesC)