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Question
Four of the following five are alike in a certain way and so form a group . Which one of the following does not belong to that group?
53
73
63
83
ANSWER : 3
Descrption
<p>The numbers 53, 73, and 83 are all <strong>prime numbers</strong> (numbers that are divisible only by 1 and themselves). In contrast, <strong>63</strong> is <strong>not a prime number</strong>; it is divisible by numbers other than 1 and itself (specifically, it is divisible by 3 and 21). Therefore, 63 is the number that does not belong to the group of prime numbers (53, 73, 83).</p>
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