Letter & Semantic Series Quiz: Reasoning Practice
10 timed series questions. Letter gaps, alternating and alphanumeric series, repeating letter patterns, wrong-term spotting and logical word order.

Letter & Semantic Series Quiz: Reasoning Practice
Tip: use keys 1-4 to answer, Enter for next.
Answers to the starter quiz
Spoilers! These are the Starter quiz’s answers. Easy, Medium, Hard and Mixed rounds show their own answers when you finish.
Find the next letter: A, C, F, J, O, ?
- T
- U
- V
- S
Answer: U. The gaps grow by one: +2, +3, +4, +5, so the next gap is +6. O is 15, and 15 + 6 = 21, which is U.
Find the next term: BDF, GIK, LNP, ?
- QSU
- QRS
- PRT
- RTV
Answer: QSU. Each group is three letters with a gap of 2, and each group starts 5 letters after the previous one: B(2), G(7), L(12), Q(17). Q + 2 = S, S + 2 = U.
Find the next term: AZ, CX, EV, GT, ?
- IS
- HR
- JQ
- IR
Answer: IR. The first letters move +2 (A, C, E, G, I) and the second letters move −2 (Z, X, V, T, R), giving IR.
Find the next term: KM5, IP8, GS11, EV14, ?
- CX17
- DY17
- CY17
- CY18
Answer: CY17. First letters go −2 (K, I, G, E, C), second letters +3 (M, P, S, V, Y) and the numbers +3 (5, 8, 11, 14, 17).
Arrange in a logical sequence: 1. Seed 2. Flower 3. Tree 4. Fruit 5. Sapling
- 1, 5, 3, 2, 4
- 1, 3, 5, 2, 4
- 5, 1, 3, 4, 2
- 1, 5, 2, 3, 4
Answer: 1, 5, 3, 2, 4. A seed grows into a sapling, the sapling into a tree, the tree flowers, and the flower develops into fruit.
Arrange in a logical sequence: 1. Paragraph 2. Letter 3. Word 4. Sentence 5. Chapter
- 3, 2, 4, 1, 5
- 2, 3, 1, 4, 5
- 2, 4, 3, 1, 5
- 2, 3, 4, 1, 5
Answer: 2, 3, 4, 1, 5. From smallest unit to largest: letter, word, sentence, paragraph, chapter.
Arrange from shortest to longest: 1. Decade 2. Month 3. Century 4. Fortnight 5. Week
- 4, 5, 2, 1, 3
- 5, 4, 2, 1, 3
- 5, 4, 1, 2, 3
- 5, 2, 4, 1, 3
Answer: 5, 4, 2, 1, 3. Week (7 days) < fortnight (14 days) < month < decade (10 years) < century (100 years).
Which letters fill the blanks, in order? ab_da_cd_bcd
- cab
- bca
- cba
- abc
Answer: cba. The block "abcd" repeats: ab(c)d a(b)cd (a)bcd. The blanks are c, b and a.
Find the wrong term in the series: C, F, I, L, P, R
- F
- L
- R
- P
Answer: P. The series moves +3: C(3), F(6), I(9), L(12), O(15), R(18). The fifth term should be O, so P is wrong.
Which letter is 7th to the right of the 12th letter from the left of the English alphabet?
- S
- R
- T
- E
Answer: S. The 12th letter is L. Seven places to its right is position 12 + 7 = 19, which is S.
Play next
All reasoning quizzes →
Number Series Quiz: Reasoning Practice
10 timed number series questions. Missing terms, squares and cubes, multiply-and-add patterns and a wrong-number question. With the pattern explained for each.

Analogy Quiz: Reasoning Practice
10 timed analogy questions. Word relations, instruments and units, collective nouns, number pairs and letter-shift analogies. Each with the rule explained.

Classification (Odd One Out) Quiz: Reasoning Practice
10 timed odd-one-out questions. Words, numbers, number pairs and letter groups. With the common property of the other three explained for each.

Coding–Decoding Quiz: Reasoning Practice
10 timed coding–decoding questions. Letter shifts, opposite letters, reversal codes, number values, substitution and common-word sentence codes.