During a $420-$day period of record, earthquakes of magnitude $6$ occurred $20$ times. The return period is calculated as $\_\_\_\_\_\_$ days.

Group of answer choices

$20-$: $6$

$420-$: $6$

$420-$: $1$

$6\backslash$times $20$

$420-$: $20$

Answer rating: 100% (QA)

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