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Anonymous users2024-01-24The key point of the 21 seconds problem is: how is it calculated to use 12 seconds for 5 sounds. It's just how many seconds does it take for 1 sound.。。
The ringtone for this question is calculated as follows: 12 (5-1) = 3 seconds.
The time taken for 8 tones is 3*(8-1)=21 seconds.
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