Alphabet series with two interleaved progressions: Z, S, W, O, T, K, Q, G, ?, ? Find the next two letters by analyzing the pattern at odd and even positions separately.

Introduction / Context:
This verbal reasoning question tests recognition of interleaved alphabet sequences. Many letter-series puzzles are built from two simpler patterns woven together: one rule applies to letters in odd positions and another rule to letters in even positions. Spotting and extending both rules leads to the correct missing letters.

Given Data / Assumptions:

• Series: Z, S, W, O, T, K, Q, G, ?, ?
• Alphabet positions: A=1, B=2, …, Z=26.
• Assume a consistent rule at odd indices and another at even indices.

Concept / Approach:
Separate the sequence into two lists: the letters in odd places and the letters in even places. Compute their position values and look for steady increments or decrements. Project each rule forward to obtain the 9th and 10th letters.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

• N, D or O, C or O, D violate at least one of the constant-step rules (they do not match −3 for odd or −4 for even indices).

Common Pitfalls:
Trying to force a single-step pattern across all terms, or overlooking that two independent streams are interleaved. Always test odd/even position rules when direct patterns look inconsistent.

Final Answer:
N, C