The sequence 13 17 23 27 33 37

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Question from Shriya, a student:

The first term of a sequence is 13.
The following terms are found by alternately adding 4 and 6 to the previous term.
The first six terms are 13 17 23 27 33 37.
Find the 80th term.

Hi Shriya,

Focus on the even numbered terms, 17, 27, 37,...

Penny

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