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?
+201 the answer is 13 because multiples of 9 are 1,3 and 9, so the first and third terms are 1 and 9
so the second term is 5, +4 is nine, +4 is 13
+201 i still need to solve those problems but this is pretty fun to do :)
