Q. Let (A₇, ⊗₇)=({1, 2, 3, 4, 5, 6}, ⊗₇) is a group. It has two sub groups X and Y. X={1, 3, 6}, Y={2, 3, 5}. What is the order of union of subgroups?

• 65
• 5
• 32
• 18

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