CT 2: Classification of Numbers – II

1.If p is a prime number such that p² - 8p - 65 > 0, then the smallest value of p is

2. Which one of the following is the average of all prime numbers between 21 and 55?

3. How many twin primes are there between 1 and 100 ?

4. A two-digit number, 9A, is a prime number. Find A.

5. If the Highest Common Factor (H.C.F.) of two numbers is 1, then they are called -

6. The sum of three prime numbers is 90. If one of them exceeds another by 30, then one of the numbers is:

7. (N^p-1 - 1) is a multiple of p, if N is prime to p and p is a?

8. How many twin primes are there between 51 and 100 ?

9. Which is not a prime number?

10. Which one of the following is not a prime number