SSC JE Electrical Engineering 2017 Set 1 Paper

Condition (1)
62 # 51 = 0
⇒ (6 + 1) – (2 + 5) = 7 –7 = 0
Condition (2)
82 # 54 = 5
⇒ (8 + 4) – (2 + 5) = 12 – 7 = 5
Similarly,
Condition (3)
⇒ 72 # 66
⇒ (7 + 6) – (2 + 6) = 13 – 8 = 5
This will be the correct answer.