An amoeba can do an unusual mathematical trick: It multiplies by dividing. After it has grown to a certain size, the amoeba's single cell divides in half to produce two amoebas. In about a day, the two amoebas have grown to the point at which they are ready to divide and form four; the day after that, there are eight amoebas, and so forth. How many amoebas will there be at the end of the week? (Harold R. Jacobs, Mathematics: A Human Endeavor)
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"The first day of the week is when there is one amoeba in 24 hours it grows and divides to become two.
Second day the 2 will divide into 4, third day 4 will divide into 8, fourth day 8 into 16 and so on. On the seventh day of the week there will be 128 amoebas in total.
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