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A certain jewelry store sells customized rings in which [#permalink]
15 Oct 2004, 12:21
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A certain jewelry store sells customized rings in which
three gemstones selected by the customer are set in
a straight row along the band of the ring. If exactly
5 different types of gemstones are available, and if
at least two of the gemstones in any given ring must
be different, how many different rings are possible?