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If n and m are positive, is m < 9 < n ?
(1) m < n and mn = 81.
(2) m^2 < 81 < n^2
(1) m < n and mn = 81.
(2) m^2 < 81 < n^2
29 Aug 2019, 07:42
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Bunuel
If n and m are positive, is m < 9 < n ?
(1) m < n and mn = 81.
(2) m^2 < 81 < n^2
(1) m < n and mn = 81.
(2) m^2 < 81 < n^2
#1
we can say that n=81 and m=1 so sufficient
#2
squaring both sides we get m < 9 < n
sufficieint
IMO D
05 Dec 2019, 05:32
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Why can't we take 3 and 27 as m and n respectively ?
