Question

Write natural numbers form 2 to 20. What fraction of them are prime numbers.

Answer 1

Answer:

the natural number from 2 to 20 are 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20. there are 19 natural numbers.

prime numbers are 2,3,5,7,11,13,17,19.

there are 8 prime numbers .

fraction of prime numbers =number of prime number ÷ total numbers

=8/19

Answer 2

Answer:

\begin{gathered}\blue { Natural \: numbers \: 2 \:to \: 20 \:are ;}\\\orange { 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}\end{gathered}

Naturalnumbers2to20are;

2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20

\pink { Prime \: numbers \: from \:2 \:to \:20}= { 2,3,5,7,11,13,17\:and \: 19}Primenumbersfrom2to20=2,3,5,7,11,13,17and19

Total\: natural \: numbers \: from \: 2 \:to\:20= 19Totalnaturalnumbersfrom2to20=19

Total\: prime \: numbers \: from \: 2 \:to\:20= 8Totalprimenumbersfrom2to20=8

\red {Required \:fraction = \frac{8}{19}}Requiredfraction=

19

8