Find the odd one out: 2, 4, 8, 16, 18 MCQ with Answer and Explanation

Explanation:
Grandfather's only son is Ravi's father. His daughter is Ravi's sister.

Explanation:
Replacing: 16 + 4 − 2 ÷ 8 × 4. Order of operations: first ÷ and ×: 2÷8=0.25, 0.25×4=1. Then 16+4−1=19. Not matching. Recalculate symbols: + means ×, × means −, − means ÷, ÷ means +. So 16 ÷ 4 × 2 − 8 + 4 becomes 16 + 4 − 2 ÷ 8 × 4. Yes 16 + 4 − (2÷8)×4 = 20 − 0.25×4 = 20 −1 =19. Not in options. Perhaps left to right. Some exams ignore BODMAS. If left to right: 16+4=20, 20−2=18, 18÷8=2.25, 2.25×4=9. Not. Perhaps the expression is evaluated differently. Let's choose a standard one.

Explanation:
Differences: +5, +10, +15, +20, so next difference is +25: 56+25=81.