SOLUTION: find index of <2> in Z24

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Question 975319: find index of <2> in Z24
Answer by farohw(175) About Me  (Show Source):
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The index of <2> in the group Z24 is |Z24|/|<2>| = 24/2 = 12.

This means there are 12 elements in the subgroup <2> = {0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22}.