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21. If n(G) = 20, n(H) = 30, n(GN H) = 5, find n(GU H) 22. If n(G) = 5, n(H) = 8, n(GN H) = 4, find n(GU H)

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21. If n(G) = 20, n(H) = 30, n(GN H) = 5, find n(GU H) 22. If n(G) = 5, n(H) = 8, n(GN H) = 4, find...

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