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The product of the first and the third terms of an arithmetic sequence is 5. If all terms of the sequence are positive integers, what is the fourth term?

 Apr 15, 2020
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What positive integers multiply to 5 ?

 

1   and  5 only        so     a1 = 1     and a3 = 5

a1 + 2d = 5

1 +2d = 5

d =2                1    3    5    7

 Apr 15, 2020

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