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12 Dec 2016, 12:28
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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:
15%
(low)
Question Stats:
79% (01:05) correct
21%
(01:03)
wrong
based on 57
sessions
History
Date
Time
Result
Not Attempted Yet
12 Dec 2016, 14:15
Kudos
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Bunuel
Target question: Is j prime?
Statement 1: j + 1 is not prime
There are several values of j that satisfy statement 1. Here are two:
Case a: j = 3, in which case j+1 = 4 and 4 is not prime. In this case j IS prime
Case b: j = 9, in which case j+1 = 10 and 10 is not prime. In this case j is NOT prime
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statement 2: j is odd
There are several values of j that satisfy statement 1. Here are two:
Case a: j = 3 (and 3 is odd). In this case j IS prime
Case b: j = 9 (and 9 is odd). In this case j is NOT prime
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT
Statements 1 and 2 combined
There are several values of j that satisfy BOTH statements. Here are two:
Case a: j = 3, in which case j is odd AND j+1 is not prime. In this case j IS prime
Case b: j = 9, in which case j is odd AND j+1 is not prime. In this case j is NOT prime
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT
Answer: E
Cheers,
Brent
02 Feb 2023, 19:41
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