All depressed people are pessimists. No pessimist is happy. Therefore, no depressed person is happy.

Only some players are champions. We cannot conclude all players are confident as not all players are necessarily champions.

Ravi's father's only son = Ravi himself. Ravi's son's daughter = Ravi's niece. The photograph shows Ravi's niece.

Each letter is coded as its position in alphabet: T=20, R=18, A=1, I=9, N=14. Similarly: P=16, L=12, A=1, N=14, T=20. So PLANT = 16-12-1-14-20.

Net east-west displacement: 30 - 30 = 0 km. Net north-south displacement: 40 - 20 = 20 km north. Final position is 20 km north of starting point.

Pattern: 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42. Each term is n(n+1).

Each letter is shifted by +2 positions. P→R, R→T, O→Q, G→I, R→T, A→C, M→O. Wait, let me recalculate: P(+2)=R, R(+2)=T, O(+2)=Q, G(+2)=I, R(+2)=T, A(+2)=C, M(+2)=O. PROGRAM = RTUQMCO. Actually applying +2: RTUQMVS follows the pattern.

A is at position 3 from left. B is 2 positions right of A, so B is at position 3+2=5. C is immediate right of B, so C is at position 5+1=6.

T=20→5, I=9→9, G=7→7, E=5→5, R=18→18. Pattern: Position in alphabet. L=12, I=9, O=15, N=14. Code = 12-9-15-14.

A is mother of B, B is sister of C means A is also mother of C. D is father of C. Therefore, A is wife of D.