$⎡ ⎢ ⎣ \begin{matrix} 12 & 47 & 21 10 & 52 & 4 64 & ? & 24 \end{matrix} ⎤ ⎥ ⎦$

40

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83

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62

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16

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Solution

The correct option is B $83$
$⎡ ⎢ ⎣ \begin{matrix} 12 & 47 & 21 10 & 52 & 4 64 & ? & 24 \end{matrix} ⎤ ⎥ ⎦$
We can see that dividing third number in each row with second digit of middle number and multiplying with first digit gives first member.
Similarly, out of $4$ options, dividing $24$ by $3$ and multiplying by $8$ gives $64$ .
$\Rightarrow$ Option $(B)$ .

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⎡⎢⎣1247211052464?24⎤⎥⎦

The correct option is B 83⎡⎢⎣1247211052464?24⎤⎥⎦We can see that dividing third number in each row with second digit of middle number and multiplying with first digit gives first member.Similarly, out of 4 options, dividing 24 by 3 and multiplying by 8 gives 64.⇒ Option (B).

$⎡ ⎢ ⎣ \begin{matrix} 12 & 47 & 21 10 & 52 & 4 64 & ? & 24 \end{matrix} ⎤ ⎥ ⎦$