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Determination of Significant Digits in a Number

Find the miss...

Question

Find the missing number in the following question.
$3$ $6$ $9$
$5$ $8$ $20$
$4$ $7$ $?$

A

11

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B

14

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C

28

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D

12

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Solution

The correct option is B $14$
The third term of each row is half the product of the two numbers. Thus $? = \frac{1}{2} (4 \times 7) = 14$

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