number analogy
Which number is like the given set of numbers ?
Give set : (3,17,31)
Option:
A. 5
B. 15
C. 45
D. 49
Answer: A . 5
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Justification:
Clearly, the numbers in the given set are all prime numbers.
5 is also a prime number and so belong to the same group.
Hence, the answer is (a).
