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Fundamental Principle of Counting

Which number ...

Question

Which number can be placed at the sign of interrogation?
6 6 8
5 7 5
4 3 ?
120 126 320

A

12

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B

16

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C

8

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D

4

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Solution

The correct option is C 8
In column 1, the rule applied is
$6 \times 5 \times 4 = 120$
In column 2
$7 \times 6 \times 3 = 126$
Therefore, in column 3
$8 \times 5 \times x = 320$
$x = 8$
Answer is Option C

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