Number & Alphabet Series • Topic 3 of 4

Alphanumeric & Mixed Series

Mixed series interleave letters and numbers (A1, C3, E5 …) or run two patterns at once. Separate the streams: read all the letters as one series and all the numbers as another, solve each, then recombine.

Split into two streams

A term like "A1, C3, E5" carries two patterns at once: a letter series and a number series. Solve them separately, then glue the answers back together.

A1, C3, E5 → letters A, C, E (step +2 → G) and numbers 1, 3, 5 (step +2 → 7). So the next term is G7.

Watch for a link. Sometimes the number equals the letter's position (A1, B2, C3…). Spotting that link instantly gives the next term. Otherwise treat the two streams as completely independent.

✅ Solved examples

1. Next: A1, B2, C3, ?
Letters +1, numbers +1: D4.
2. Next: A2, C4, E6, ?
Letters +2 (A,C,E,G), numbers +2 (2,4,6,8): G8.
3. Next: Z1, Y2, X3, ?
Letters −1 (Z,Y,X,W), numbers +1: W4.
4. Next: B1, D4, F9, ?
Letters +2 (B,D,F,H), numbers are squares 1,4,9,16: H16.

✏️ Practice — try these, take hints as needed

1. Next: A3, B6, C9, ?
Letters +1, numbers +3.
—
—
D12
2. Next: M1, N2, O3, ?
Letters +1, numbers +1.
—
—
P4
3. Next: A1, C2, E3, ?
Letters +2, numbers +1.
—
—
G4
4. Next: P5, Q10, R15, ?
Letters +1, numbers +5.
—
—
S20
5. Next: A1, B4, C9, ?
Letters +1, numbers squares.
4^2.
—
D16

📝 Topic test — 8 questions

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