Prove that S, is isomorphic to a subgroup of An+2-
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- 19. With and as in Exercise 18, prove that is a subgroup of . Exercise18: 18. If is a subgroup of , and is a normal subgroup of , prove that .Exercises 35. Prove that any two groups of order are isomorphic.18. If is a subgroup of the group such that for all left cosets and of in, prove that is normal in.