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Even
Source: Beat The GMAT — Data Sufficiency |
statement 1:
r+s is even
we know that for the result to be even either both the numbers should be even or both the numbers should be odd
so r&s are both even or r&s are both odd
And moreover we have no info about t
Insufficient
statement 2:
s+t is even
As per the same logic either s &t are both even or s& t are both odd
There is no info about t
Insufficient
Combining both the statements we get
r,s and t are all even or r,s,t are all odd
when r,s & t are all even r+s+t results in an even number
when r,s & t are all odd r+s+t results in an odd number
So the ans is E..
r+s is even
we know that for the result to be even either both the numbers should be even or both the numbers should be odd
so r&s are both even or r&s are both odd
And moreover we have no info about t
Insufficient
statement 2:
s+t is even
As per the same logic either s &t are both even or s& t are both odd
There is no info about t
Insufficient
Combining both the statements we get
r,s and t are all even or r,s,t are all odd
when r,s & t are all even r+s+t results in an even number
when r,s & t are all odd r+s+t results in an odd number
So the ans is E..
OA - E.
Thanks for the explanation raju232007. I messed up when I combined both the equations and your explanation helped me understand my error.
Thanks for the explanation raju232007. I messed up when I combined both the equations and your explanation helped me understand my error.
