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24 Sep 2018, 14:20
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
36% (01:19) correct
64%
(01:36)
wrong
based on 48
sessions
History
Date
Time
Result
Not Attempted Yet
If a^b = 289, what is the value of a - b?
(1) b is not equal to 1
(2) a and b are integers
(1) b is not equal to 1
(2) a and b are integers
24 Sep 2018, 16:34
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santorasantu
Target question: What is the value of a-b?
Given: a^b = 289
Jump straight to....
Statements 1 and 2 combined
There are several values of a and b that satisfy BOTH statements. Here are two:
Case a: a = 17 and b = 2. Notice that 17^2 = 289. In this case, the answer to the target question is a - b = 17 - 2 = 15
Case b: a = -17 and b = 2. Notice that (-17)^2 = 289. In this case, the answer to the target question is a - b = -17 - 2 = -19
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT
Answer: E
Cheers,
Brent
