Question

3. State whether the following numbers are prime or composite a. 7 b. 11 c. 21 d. 13 e. 63 . class 4 ncert ​

Answer 1

Answer:7 prime,11 :prime,21:composite

13:prime,63:composite

Step-by-step explanation:

7 is prime since it has only two factors 1 and 7

Similarly 11 is prime because its factors are 1 and 11

21 is composite since it has more than 2 factors which are 1,3,7,21

13 is prime because it factors are 1 and 13

63 is composite because its factors are 1,3,7,9,63