The answer should be D.
Statement I
c^2-1 odd
Therefore C has to be even, Hence Sufficient.
Statement II
(C-3)(D+2) odd
it means C-3 is odd & D+2 is odd
C-3 can only be odd if C is even.
Hence Sufficient.
Answer D.
Whats the OA?
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Number Properties
Source: Beat The GMAT — Data Sufficiency |
OA is D.
(C-3) (D+2) is odd.
This can be a possible scenario
even * Odd = Odd
Odd * even = odd
if C-3 is even C is odd
if C-3 is odd C is even
Can you please help in this inference that for (C-3) (D+2) to be odd
C-3 has to be Odd
Thanks
(C-3) (D+2) is odd.
This can be a possible scenario
even * Odd = Odd
Odd * even = odd
if C-3 is even C is odd
if C-3 is odd C is even
Can you please help in this inference that for (C-3) (D+2) to be odd
C-3 has to be Odd
Thanks
These two scenarios can never be possiblepandesag wrote:
This can be a possible scenario
even * Odd = Odd
Odd * even = odd
even * Odd = Odd
4*5=20
Odd * even = odd
9*2=18
I think you are confusing this addition rule.
even + Odd = Odd
Odd + even = odd
Let me know if you still have any doubts.
