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equal 1?

by sanju09 » Fri Aug 27, 2010 5:23 am
Does the product jkmn equal 1?

(1) jk/mn = 1.

(2) j = 1/k and m = 1/n.


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by Rich@VeritasPrep » Fri Aug 27, 2010 5:38 am
Does the product jkmn equal 1?

(1) jk/mn = 1.

jk and mn could both be 1, in which case jkmn would be 1. But jk and mn could both be 2, in which case jkmn would be 4.

INSUFFICIENT

(2) j = 1/k and m = 1/n.

If j=1/k, then jk=1

If m=1/n, then mn=1.

Therefore, jkmn=1.

SUFFICIENT
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