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2014-06-19T16:46:35+08:00

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Roster method for alphabet :
A = {r, s, t, u, v, w, x, y, z}

C = The set containing the reciprocals of 3, 6, 12 and 15.

(If that had 1/9, I would have answered the set containing the reciprocals of multiples of 3 between 0 and 16.)
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