4. Sum of the number of primes between 16 to 80 and 90 to 100 is:
(i) 20
(ii) 18
(1) 17
5. A number is divisible by 5 and 6. It may not be divisible by:
(i) 10
(ii) 15
(iii) 30
B. Which of the following statements are correct?
1. 1 is a composite number.
2. All the odd numbers are the prime numbers.
3. A composite numbers has at least 3 factors.
4. A number is the greatest factor of itself.
5. lis factor of every number.
6. The multiples of a number are limited.
7. A prime number is always even.
8. A number is either composite or prime.
A prime number has only two factor.
10. Every multiples of a number is exactly divisible by the number.
C. Write the multiples of 6 which are greater than 20 and less than 50.
D. Write all the prime numbers between 1 and 15.
E. Write all the composite numbers between 1 and 30.
F. Write all the prime numbers between the following:
1. 31 and 50
2. 50 and 90
Answers
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