Next CSE-PPT: 14 March 2027 · Professional & Subprofessional
Civil Service Exam Professional reviewer on symbolic logic and abstract reasoning: letter shift and reverse codes, number codes, symbol substitution, coded relationships and pattern rules.
Symbolic logic and abstract reasoning are part of the official Analytical Ability scope of the Civil Service Exam Professional level. This set practises the most common forms: letter-shift and reverse-alphabet codes, number codes, words written backwards, symbol substitution in arithmetic, coded relationships, positions in the alphabet and pattern rules.
Find the rule from the example before touching the question: compare the first letter of the word with the first letter of the code and count the shift, then check it on every letter. Every answer here was checked by script.
Correct answer: D. EPH
Each letter is moved one place forward in the alphabet: C→D, A→B, T→U. Applying the same rule to DOG gives D→E, O→P, G→H, so DOG becomes EPH.
Read detailsCorrect answer: A. EHKD
Moving each letter one place back gives F→E, I→H, L→K, E→D, so FILE becomes EHKD. GJMF would be the result of moving each letter one place forward instead.
Read detailsCorrect answer: C. OZD
Opposite letters add up to 27 in position: L (12) ↔ O (15), A (1) ↔ Z (26), W (23) ↔ D (4). So LAW becomes OZD. Remembering that A↔Z, M↔N helps you find any opposite quickly.
Read detailsCorrect answer: A. 3-1-2
Each letter is replaced by its position: C = 3, A = 1, B = 2, so CAB is 3-1-2. The order of the numbers must follow the order of the letters in the word.
Read detailsCorrect answer: C. 18
Using letter positions, B = 2, I = 9 and G = 7, so BIG = 2 + 9 + 7 = 18. Knowing that E = 5, J = 10, O = 15 and T = 20 helps you find other positions quickly.
Read detailsCorrect answer: C. MROF
The code simply writes the word backwards: WORD → DROW. Reversing FORM gives M-R-O-F, so the answer is MROF. Before looking for a letter shift, always check whether the code is simply the word reversed.
Read detailsCorrect answer: C. RGP
Each letter moves two places forward: B→D, O→Q, K→M. Applying +2 to PEN gives P→R, E→G, N→P, so PEN becomes RGP. Check the rule on every letter: the two O's both become Q, which confirms a constant shift.
Read detailsCorrect answer: B. SALARY
The code moves each letter one place forward (P→Q, A→B, E→F, R→S). To decode, move each letter one place back: T→S, B→A, M→L, B→A, S→R, Z→Y, giving SALARY.
Read detailsCorrect answer: C. SUN
Convert each number to its letter: 19 = S, 21 = U and 14 = N, so the word is SUN. Counting from known anchors such as T = 20 makes the conversion faster.
Read detailsCorrect answer: B. 26
Replace the symbols: 8 × 3 + 6 − 4. Multiply first: 24, then add and subtract from left to right: 24 + 6 − 4 = 26. Forgetting the order of operations and working left to right would also give 26 here, but not in general, so always apply it.
Read detailsCorrect answer: B. 7
Replace each symbol: 24 ÷ 4 + 3 × 2 − 5. Division and multiplication first: 6 + 6 − 5 = 7. Writing the new expression in full before calculating prevents mistakes.
Read detailsCorrect answer: A. O
The tenth letter is J. Counting five places to the right gives K, L, M, N, O, so the answer is O, the fifteenth letter. "To the right" means towards Z; "to the left" would mean counting back towards A.
Read detailsCorrect answer: B. G
C is the 3rd letter and K is the 11th. The midpoint is (3 + 11) ÷ 2 = 7, and the 7th letter is G. Check: G is four letters after C and four letters before K.
Read detailsCorrect answer: D. W
Counting from Z backwards: Z (1st), Y (2nd), X (3rd), W (4th). So the answer is W. D is the fourth letter from the left end.
Read detailsCorrect answer: D. FLWB
Each letter moves three places forward: R→U, O→R, A→D, D→G. For CITY: C→F, I→L, T→W and Y→B (counting past Z back to A, B), giving FLWB.
Read detailsCorrect answer: B. HAPPY
If the code uses the next letter, decoding means moving each letter one place back: I→H, B→A, Q→P, Q→P, Z→Y. The word is HAPPY.
Read detailsCorrect answer: B. X is the mother of Z
X ★ Y means X is the mother of Y, and Y © Z means Y is the brother of Z. Since Y and Z are siblings, X is also the mother of Z.
Read detailsCorrect answer: C. 50
The rule is n² + 1: 3² + 1 = 10 and 5² + 1 = 26. So 7 → 7² + 1 = 50. Always test a rule on every given pair before applying it.
Read detailsCorrect answer: C. 34
Apply the definition: 3 ⊕ 5 = 3² + 5² = 9 + 25 = 34. Note that 64 would be (3 + 5)², a different operation. Check the definition on the example first: 2² + 3² = 4 + 9 = 13, as given.
Read detailsCorrect answer: D. MOP
In ACE, BDF and GIK, each letter skips one letter (A_C_E, B_D_F, G_I_K). In MOP, O and P are next to each other, so MOP breaks the pattern. Following the rule it would be MOQ.
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