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Properties of Square Numbers

Find the miss...

Question

Find the missing number in the following:

9 4 20
8 5 12
7 6 ?

A

2

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B

4

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C

6

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D

9

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Solution

The correct option is B 4
9 4 20
8 5 12
7 6 ?
$I^{s t}$ row $(9 - 4) \times 4 = 20$
$I I^{n d}$ row $(8 - 5) \times 4 = 12$
$I I I^{r d}$ row $(7 - 6) \times 4 = 4$

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