Mixed Series

A mixed series combines two separate patterns in one sequence — a letter pattern and a number pattern running side by side. Each term has both a letter and a number, for example: A1, C3, E5, G7, ?

Your job is to spot both patterns independently, then combine them to find the missing term. Letters follow one rule; numbers follow a completely different rule.

1. Separate the letters from the numbers. Write them out as two independent sequences.
2. Find the letter pattern: count the alphabetic gaps between consecutive letters (A→C = +2, C→E = +2 …).
3. Find the number pattern: look at differences between consecutive numbers (1→3 = +2, 3→5 = +2 …).
4. Apply each pattern to get the next letter and the next number.
5. Combine them to form the answer term.

Example 1: A1, C3, E5, G7, ?

• Letters: A, C, E, G — each jumps +2 positions → next is I
• Numbers: 1, 3, 5, 7 — each increases by +2 → next is 9
• Answer: I9

Example 2: B2, E5, H8, K11, ?

• Letters: B, E, H, K — each jumps +3 positions → next is N
• Numbers: 2, 5, 8, 11 — each increases by +3 → next is 14
• Answer: N14

• Treating the term as one unit — never guess "add 2 to A1 to get C3" as one operation. Always split letter and number before analysing.
• Confusing letter position with letter value — A = 1, B = 2, C = 3 … keep this mapping ready.
• Assuming both patterns must be the same — in harder questions the letter gap and number gap are different (e.g., letters +3, numbers +4).

1. What comes next? D4, G7, J10, M13, ___
2. Find the missing term: Z2, X4, V6, T8, ___

(Answers: 1 → P16; 2 → R10)