From the table along the columns,
8 + 9 = 17
2 + 8 = 10
Sum of the top two numbers is equal to the bottom number in a column.
Let the required number = a
Similarly, 10 + a = 19
$$\Rightarrow$$Â a = 9
$$\therefore\ $$The required number = 9
Hence, the correct answer is Option B
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