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27 Dec 2016, 08:56
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A
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66% (01:45) correct
34%
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If m and n are integers, are they consecutive numbers?
(1) mn + 1 is even.
(2) mn < m^2 + m
(1) mn + 1 is even.
(2) mn < m^2 + m
27 Dec 2016, 11:14
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Bunuel
(1) since mn+1=even
then mn must be odd no.
so m & n are odd nos.
thus are not consecutive....suff
(2)m(n-1)<m^2
if m=1 & n=0 then Yes
if m=5 , n=0 then No
insuff
Ans A
27 Dec 2016, 11:26
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Bunuel
I have another thoughts. Please correct me if i'm wrong.
(1) mn + 1 is even.
mn = odd m-odd, n - odd sufficient.
(2) mn < m^2 + m
n < m + 1 ----> n - m < 1 and m - n > -1
Because n and m are integers we have only one possible soluion n - m = 0 or n = m Sufficient.
Answer D
