Question: How do I solve this question? How many 2-element subsets does the set { 1, 2, 3, 4, 5, 6, 7} have

How do I solve this question?

How do I solve this question? How many 2-element subsets does the

How many 2-element subsets does the set { 1, 2, 3, 4, 5, 6, 7} have

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