In the table along the columns,
24 + 5 + 9 = 38
30 + 7 + 1 = 38
Sum of numbers along the columns is 38.
Let the required number = a
Similarly from third column,
19 + 18 + a = 38
$$\Rightarrow$$Â a = 1
$$\therefore\ $$The required number = 1
Hence, the correct answer is Option B
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