Numberphile takes a look at three interesting infinite series. The first is 1 + 1/2 + 1/4 + 1/8 … which equals 2. The second is 1 + 1/2 + 1/3 + 1/4 + 1/5 … which equals infinity. The third is 1 + (1/2)2 + (1/3)2 + (1/4)2… which π2/6
Three interesting infinite series
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