Along the second column and third column,
6 - 3 = 3
6 - 1 = 5
Difference of first two numbers in a column is equal to the third number in the column.
Let the missing number = a
Similarly from the first column,
2 - 8 = a
$$\Rightarrow$$Â a = -6
$$\therefore\ $$The missing number = -6
Hence, the correct answer is Option C
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