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14 Jul 2019, 23:05
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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:
35%
(medium)
Question Stats:
68% (01:18) correct
32%
(01:00)
wrong
based on 50
sessions
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Date
Time
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Not Attempted Yet
Is the integer k a prime number?
(1) k + 1 is prime.
(2) k + 2 is not prime.
(1) k + 1 is prime.
(2) k + 2 is not prime.
14 Jul 2019, 23:15
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Answer is E. Take 2 sets of number: 1) 2,3,4 and 2)4,5,6. K can't be ascertained to be prime.
Statement 1 says: We have 2 consequtive numbers out of which the 2 Nd is prime. Apply it to the two sets of numbers. Clearly insufficient. So we are left with B,C,E
Statement 2: K+2 is not prime. Apply to the 2 sets and you will find k can't be ascertained to be prime. Now we are left with C and E.
Combining both statements, K still can't be ascertained. Hence E.
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Statement 1 says: We have 2 consequtive numbers out of which the 2 Nd is prime. Apply it to the two sets of numbers. Clearly insufficient. So we are left with B,C,E
Statement 2: K+2 is not prime. Apply to the 2 sets and you will find k can't be ascertained to be prime. Now we are left with C and E.
Combining both statements, K still can't be ascertained. Hence E.
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saurabh9gupta
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14 Jul 2019, 23:15
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My aporoach
We can take numbers such as 0 1 2 3 etc
Stmt A
K+1 is prime..
K can be 1 (non prime) in that case k+1 is prime
K can be 2 (prime) in that case k+1 is prime
Not sufficient
Stmt B
K can be 2 (prime) in that case k+2 is not prime
K can be 3 (prime) in that case k+2 is prime
Not sufficient
Taking both together only k=3 and k=1 are out
So C
Posted from my mobile device
We can take numbers such as 0 1 2 3 etc
Stmt A
K+1 is prime..
K can be 1 (non prime) in that case k+1 is prime
K can be 2 (prime) in that case k+1 is prime
Not sufficient
Stmt B
K can be 2 (prime) in that case k+2 is not prime
K can be 3 (prime) in that case k+2 is prime
Not sufficient
Taking both together only k=3 and k=1 are out
So C
Posted from my mobile device
