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Find the odd man out from the following series- 2, 3, 5, 7, 11, 13, 17, 19, 21, 23.

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Find the odd man out from the following series- 2, 3, 5, 7, 11, 13, 17, 19, 21, 23.
posted Jun 11 by Puneet Batra
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1 Answer

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21


All primes except for 21

answer Jun 11 by Hanifa Mammadov

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