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20 Apr 2018, 06:26
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
85% (00:49) correct
15%
(01:06)
wrong
based on 71
sessions
History
Date
Time
Result
Not Attempted Yet
If m and n are positive integers, is the product mn even?
(1) m + 1 is odd.
(2) m + n is odd
(1) m + 1 is odd.
(2) m + n is odd
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
20 Apr 2018, 09:27
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Bunuel
Statement (1) is sufficient.
m+1 is odd, therefore m is even and product mn is even
Statement (2) is sufficient.
m+n is odd. Therefore either m or n is even and other odd.
odd+even = odd
even+odd = odd
Therefore mn is even.
Hence (D) EACH statement ALONE is sufficient is the answer.
20 Apr 2018, 10:34
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Given - m >0 , n >0
To prove: mn = even
Type- Y/N
For product to be even, one number should be even.
1. m +1 = odd
=> m is even (even+ odd= odd)
Sufficient
2. m+ n = odd
=> either m or n is even
Sufficient
Answer is D
To prove: mn = even
Type- Y/N
For product to be even, one number should be even.
1. m +1 = odd
=> m is even (even+ odd= odd)
Sufficient
2. m+ n = odd
=> either m or n is even
Sufficient
Answer is D
