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Fifth grade math problem: If the phone calls 1 person every 2 minutes, how many people can 18 minutes inform at most?
18/2 = 9, and the ninth power of 2 = 512512-1= 511.
1 inform No.2 first. Then these two will notify the 3 rd and 4 th at the same time. In the next two minutes, 1, 2, 3 and 4, notify 5, 6, 7 and 8. . And so on. . . The total notice is 5 12 people. Subtract the number 1.