Sherri W.

asked • 12/17/17

find the sum of the first 60 terms of 19,14,19,...

include formula for the sequence 

1 Expert Answer

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Philip P. answered • 12/17/17

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Assuming the sequence just repeats 19, 14, then the first 60 terms would consist of thirty 19s and thirty 14s.  So the sum would be 30·19 + 30·14.
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Philip P.

A formula for the sequence would be an = 16.5 + (2.5)·(-1)n-1    n = 1, 2, 3, ...
 
The (-1)n-1 equals 1 when n is odd and -1 when n is even, so it either adds or subtracts 2.5 from 16.5, yielding 19 when n is odd and 14 when n is even.
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12/17/17

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