In 2010 , the population of a colony is 12000  , and is decreasing exponentially at a rate of 2.1% per year.   (a) What will the population be in the year  2034 ?   (b) In what year will half of the population be left?

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.