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20 10 Guangdong college entrance examination science mathematics multiple-choice questions 8
It's simple. A * * has 55 flashing modes, namely 5*4*3*2* 1= 120.

It takes 5 seconds to blink once, and the interval is 5 seconds.

Total time =120 *10 =1200 seconds, but you don't have to wait until the last flash, so subtract 5s, which is 1 195 seconds.

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