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Question
What letter Should Come Next?
R, K, F, C, __
Options:
A .  Z
B .  Y
C .  W
D .  A
E .  D
Answer: Option D


R-7, K-5, F-3, C, __The values that are subtracted are consecutive prime numbers in decreasing order.Hence, the next letter in the series is C - 2 = A.



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