Question: Let A = {1, 2, 3, 4, 5, 6, 7}. How many symmetric relations on A contain exactly (a) Four ordered pairs? (b) Five ordered

Let A = {1, 2, 3, 4, 5, 6, 7}. How many symmetric relations on A contain exactly
(a) Four ordered pairs?
(b) Five ordered pairs?

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