Find the missing number in the following question.
$6$ $9$ $15$
$8$ $12$ $20$
$4$ $6$ $?$

5

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10

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15

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21

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Solution

The correct option is B $10$
In the first row, $6 \times \frac{3}{2} = 9, 6 \times \frac{5}{2} = 15$
In the second row, $8 \times \frac{3}{2} = 12, 8 \times \frac{5}{2} = 20$
$∴$ In the third row, missing number $= 4 \times \frac{5}{2} = 10$

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If A = {3, 6, 9, 12, 15, 18, 21}
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$\begin{matrix} A & B 1. B - C & A . {5, 10, 20} 2. A - C & B . {3, 9, 15, 21} 3. C - (A - B) & C . {3, 6, 9, 12, 18, 21} 4. C \cap (A - B) & D . {15} E . {2, 4, 6, 8, 12, 14, 16} \end{matrix}$

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Find the missing number in the following question.69158122046?

The correct option is B 10In the first row, 6×32=9,6×52=15In the second row, 8×32=12,8×52=20∴ In the third row, missing number =4×52=10

Find the missing number in the following question.
$6$ $9$ $15$
$8$ $12$ $20$
$4$ $6$ $?$

The correct option is B $10$
In the first row, $6 \times \frac{3}{2} = 9, 6 \times \frac{5}{2} = 15$
In the second row, $8 \times \frac{3}{2} = 12, 8 \times \frac{5}{2} = 20$
$∴$ In the third row, missing number $= 4 \times \frac{5}{2} = 10$