Complete the series: 25P, 16K, 9F, ?

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A 4A
B 3A
C 2B
D 5Z

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Answer: A. 4A

Numbers are perfect squares in descending order: 25, 16, 9, so next is 4.
Letters move back 5: P, K, F, so next is A.
Answer: 4A.

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Complete the series: 25P, 16K, 9F, ?

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