Find the missing letters
$1, 2, 6, 24, 120, . . . . .$

240

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320

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720

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930

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Solution

The correct option is D $720$
Pattern is $f i r s t t e r m \times 2, s e c o n d t e r m \times 3, t h i r d t e r m \times 4, f o u r t h t e r m \times 5, f i f t h t e r m \times 6 a n d s o o n . .$
$∴$ Missing number = $120 \times 6 = 720$

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Similar questions

1, 2, 6, 24, 120, . . . . .

11, 16, 23, 32, 43, . . . . . .

Fill in the missing number:

$\begin{matrix} 12 & 60 & 360 8 & 40 & 240 4 & 20 & ? \end{matrix}$

6, 24, 60, 120, 210, 336, ?, 720

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