The pattern in the series K, N, P, S, U involves skipping one letter after each. The sequence jumps by two letters: K (skip L, M) to N, N (skip O) to P, P (skip Q, R) to S, and S (skip T) to U. Following this pattern, after U, we skip V and W, leading us to the letter Y. Thus, the next letter in the series is Y.
E
H
T
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as the first letter of the greek alphabet, "alpha" comes first.
g.
The series that comes after Heroes of Olympus is called "The Trials of Apollo."
The series that comes after Trials of Apollo is called "The Tower of Nero."
The series that comes after the Heroes of Olympus is called "The Trials of Apollo."