Insert the missing number. 
Solution
Correct Answer: Option B
Look at the first two rows.
1st Row: Second Cell =7 => 7*2=14=> 14 - 12 [First Cell] = 2 [Third Cell]
2nd Row: Second Cell =5 => 5*2=10=> 10 -10 [First Cell] = 0[Third Cell]
3rd Row: Second Cell =11 => 11*2=22=> 22 -16 [First Cell] = 6[Third Cell]
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