14 Jan (01): Raindrops Keep Falling on My Head

Dropping... dropping... 5s, 6s, 3s, 4s...
When will the first time 4 raindrops come together?
How many times, in 2 hours, will the 4 raindrops come together?

Here's what S1-01 says...
Look! how many ways do we used to arrived at our answers?





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