Find the odd one: 13, 26, 39, 52, 65, 78, 91, 104, 117 MCQ with Answer and Explanation

Explanation:
The series follows the pattern of adding consecutive even numbers starting from 4: 2+4=6, 6+6=12, 12+8=20, 20+10=30, 30+12=42. Alternatively, n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42.

Explanation:
2×3+1=7, 7×4−1=27, 27×4−1=107, 107×4−1=427, 427×4−1=1707.

Explanation:
South start, left East 10, right South 5, right West 10. Net East 0, South 5 → South, but calculation: final West 10 from previous East 10 cancel, South 5. Facing or position South. Option B.