Question

write about sieve of Erasthosthenes and about identity element and also about inverse element


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Answer 1

$\textbf{Answer is in Attachment !}$

$\textbf{Sieve of Erasthosthenes }$:

This method helps us to find out Prime number from 1 to n.

Procedure :

Write all natural numbers from 1 to n.

1. The first Prime number is 2, leave 2 and round off all the multiples of 2. They are 4, 6,8... the next Prime number left is 3.

2. Round off all the multiple sof 3 except 3.

3. We have to continue this process up-to the highest Prime number which don't exceed √n.