Select the letter that can replace the question mark (?) in the following series.
A, D, C, G, F, K, J, ?
Given series is an alternate series with the two series are A, C, F, J, ... and D, G, K, ...
In A, C, F, J, ...
A + 2 = C
C + 3 = F
F + 4 = J
In D, G, K, ...
D + 3 = G
G + 4 = K
The next letter of the given series is the next letter of the series D, G, K, ...
$$\therefore\ $$The next letter of the series = K + 5 = P
Hence, the correct answer is Option D
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