Reasoning

Alphanumeric Series: Practice Questions with Answers

11 practice questions on Alphanumeric Series, with answers; most also have an explanation or a worked solution. Try each one before you open its answer.

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1. Q.1

   Find the missing term: C6, F12, I18, L24, ?

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   Answer: O30

   Solution:

   1. Letters: C, F, I, L — each position +3 (3, 6, 9, 12), so the next is position 15 = O.
   2. Numbers: 6, 12, 18, 24 — each +6, so the next is 30.

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2. Q.2

   Find the missing term: Z25, X20, V15, T10, ?

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   Answer: R5

   Solution:

   1. Letters: Z, X, V, T — each position −2 (26, 24, 22, 20), so the next is position 18 = R.
   2. Numbers: 25, 20, 15, 10 — each −5, so the next is 5.

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3. Q.3

   Find the missing term: B2, D6, F12, H20, ?

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   Answer: J30

   Solution:

   1. Letters: B, D, F, H — each position +2 (2, 4, 6, 8), so the next is position 10 = J.
   2. Numbers: 2, 6, 12, 20 — these are 1×2, 2×3, 3×4, 4×5, so the next is 5×6 = 30.

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4. Q.4

   Find the missing term: A1, C4, E9, G16, ?

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   Answer: I25

   Solution:

   1. Letters: A, C, E, G — each position +2 (1, 3, 5, 7), so the next is position 9 = I.
   2. Numbers: 1, 4, 9, 16 — these are 1², 2², 3², 4², so the next is 5² = 25.

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5. Q.5

   Find the missing term: D4, H8, L12, P16, ?

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   Answer: T20

   Solution:

   1. Letters: D, H, L, P — each position +4 (4, 8, 12, 16), so the next is position 20 = T.
   2. Numbers: 4, 8, 12, 16 — each +4, so the next is 20.

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6. Q.6

   Find the missing term: Y5, V10, S15, P20, ?

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   Answer: M25

   Solution:

   1. Letters: Y, V, S, P — each position −3 (25, 22, 19, 16), so the next is position 13 = M.
   2. Numbers: 5, 10, 15, 20 — each +5, so the next is 25.

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7. Q.7

   Find the missing term: E10, H16, K22, N28, ?

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   Answer: Q34

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8. Q.8

   Find the missing term: B3, E9, H27, K81, ?

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   Answer: N243 (letters +3 each step; numbers ×3 each step)

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9. Q.9

   Find the missing term: A2, D8, G18, J32, ?

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   Answer: M50

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10. Q.10

    Find the missing term: B4, D8, F16, H32, ?

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    Answer: J64

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11. Q.11

    Find the missing term: F12, J9, N6, R3, ?

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    Answer: V0 (letters +4 each step; numbers −3 each step)

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