Question

what is left coset and right coset?

Answer 1

The identity is in precisely one left orright coset, namely H itself. Thus H is both a left and right coset of itself. Acoset representative is a representative in the equivalence class sense. A set of representatives of all the cosets is called a transversal.

Answer 2

the identity is in precisely one left orright coset namely H itself thus h is both a both left and right