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As bacteria divide every 20 minutes for 4 hours, the number of their division equals:

4h / 20min = 240min / 20min = 12 divisions

The number of bacteria after 12 divisions is:

N = N0 × 212 , where N0 - the initial number of bacteria.

N = 100 × 212 = 100 × 4,096 = 4,096,100 bacteria.

Answer: 4,096,100 bacteria.

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