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The product of the first and the third terms of an arithmetic sequence is 9. If all terms of the sequence are positive integers, what is the fourth term?

 Apr 9, 2022
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F * [F + 2D]==9

 

F==1 - this is the first term

D ==4 - this is the common difference

 

Your sequence looks like this:

 

1, 5, 9, 13, 17, 21, 25........and so on.

 

The 4th term ==9 + 4 ==13

 Apr 9, 2022

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