Question

10. Find the numbers between 1 and 100 having exactly three factors.
11. Find the numbers between 1 and 20 having exactly two factors.
12. Find all the numbers having exactly one factor.
13. Is the sum of two even numbers even? If yes, justify with two examples.
14. Is the sum of two odd numbers even? If yes, justify with two examples.
15. Is the sum of an odd and an even number odd? If yes, justify with two examples
please answer all questions plesse​

Answer 1

8(1,2,4,8)……. So, no composite number has three factors, and prime numbers have two factors. Let us consider the square of prime numbers which are below 100. Therefore, the numbers between 1 and 100 with exactly 3 factors are 4, 9, 25, 49.

Answer 2

Answer:

12. the answer is 1 . as only one is the number that have only 1 factor