Four of the following five are alike in a certain way and so form a group Which is the one that does not belong to that group ?
The numbers can be expressed as 23 x 5, 17 x 5, 19 x 5, 15 x 5 and 31 x 5. Except for option D, all other options are multiples of 5 with a prime number. Hence, option D.
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