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Permutation: n Different Things Taken All at a Time When All Are Not Different.

Find the miss...

Question

Find the missing term.
$840, 168, 42, 14, 7, (. . . . . . . . . .)$

A

1

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B

7

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C

9

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D

12

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Solution

The correct option is B $7$
The pattern is $\div 5, \div 4, \div 3, \div 2, \div 1$ in series order.
$\frac{840}{5} = 168$

$\frac{168}{4} = 42$

$\frac{42}{3} = 14$

$\frac{14}{2} = 7$

$\frac{7}{1} = 7$
So, option B is the correct answer.

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