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tough DS

by heymayank08 » Mon Apr 30, 2012 8:44 pm
What is the value of (x - y)4?
(1) The product of x and y is 7.
(2) x and y are integers.

[spoiler]IMO:E its an easy prob
i dunno where m i going wrong pls explain the answer[/spoiler]
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by shantanu86 » Mon Apr 30, 2012 9:01 pm
IMO [spoiler][C][/spoiler]. Lets analyze,

(x-y)^4 ?
(1) The product of x and y is 7.


-There are several values of x & y possible for which the product is 7...
(1,7) (1/7,49) etc..
all of these will result in a different (x-y)^4.. NOT SUFF.
(2) x and y are integers.
-This alone is obviously NOT SUFF

Taking (1) and (2) together..
The subsets of (1) that satisfy criterion in (2) are..
(1,7) , (7,1) , (-1,-7) and (-7,-1)

all these will result in same (x-y)^4 = 6^4

Hence, the correct answer should be [spoiler][C][/spoiler].
If you feel like it, hit thanks :)
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