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A={1,2,3,4.n} and BsubeA;CsubeA, then the find number of ways of se

The diagram shows four pairs of polarizing sheets, with the polarizing directions indicated by dashed lines. The two sheets of each pair are placed one behind the other, and the front sheet

Two Pair: Poker Hand Ranking

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These cards can be sorted into three pairs, where each pair adds to the same number. What is this number?