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Question
What number should come next?
29, 29, 27, 23, 25, 19, 23, 17, __, __
Options:
A .  19, 13
B .  19, 15
C .  21, 13
D .  19, 13
E .  19, 17
Answer: Option C


29, 29, 27, 23, 25, 19, 23, 17, __, __
The given series is an alternate series. The numbers in the alternate positions starting with 29 in the first position form a series of consecutive odd numbers in decreasing order.i.e. 29, 27, 25, 23, 21.The remaining numbers form a series of prime numbers in decreasing order starting with 29 i.e 29, 23, 19, 17, 13.Hence, the next two numbers in the series are 21 and 13 respectively.



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