20. A jewelry store sells customized rings in which 3 gems selected by the customer are set in a straight row along the band of the ring. If exactly 5 different gems are available and if at least 2 gems in any given ring must be different, how many different rings are possible?
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Is this problem not specific enough? How do you know from the question that order doesn't matter. It doesnt define what different means here. It's not difficult, if you try 1 method and it doesn't have an answer you try order matters. But is this a realistic gmat problem where they make you do that?
20
60
90
120
210
Is this problem not specific enough? How do you know from the question that order doesn't matter. It doesnt define what different means here. It's not difficult, if you try 1 method and it doesn't have an answer you try order matters. But is this a realistic gmat problem where they make you do that?
