$\begin{matrix} 20 & (150) & 15 10 & (. . . .) & 7 \end{matrix}$

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140

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Solution

The correct option is B 35
Multiply the numbers in first and third column and divide it by $2$ to obtain the number in second column.
Hence, $\frac{20 \times 15}{2} = 150$
The missing number is: $\frac{10 \times 7}{2} = 35$

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