Question

write down separately the prime and composite number less than 20

Answer 1

prime numbers: 2,3,5,7,11,13,17,19
composite numbers: 4,6,8,9,10,12,14,15,16,18,20
hope this will help you

Answer 2

Here is yr answer......


Prime nos. :
~~~~~~~~~

The nos. which have 1 and itself as factors

(or)

The nos. which have 2 or less than two factors.


=> Prime nos. less than 20 ---

2 , 3 , 5 , 7 , 11 , 13 , 17 , 19


Composite nos. :
~~~~~~~~~~~~~~~

The nos. which have more than two factors.

=> Composite nos. less than 20 -----

4 , 6 , 8 , 9 , 10 , 12 , 14 , 15 , 16 , 18


Hope it hlpz...