(a) How many subgraphs H = (V, E) of K6 satisfy |V| =3? (If two subgraphs are...

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(a) How many subgraphs H = (V, E) of K6 satisfy |V| =3? (If two subgraphs are isomorphic but have different vertex sets, consider them distinct.)
(b) How many subgraphs H = (V, E) of K6 satisfy |V| =4?
(c) How many subgraphs does K6 have?
(d) For n ≥ 3, how many subgraphs does Kn have?
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