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2015-07-19T13:04:37+08:00

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10th term = 17
14th term = 30

14th term - 10th term = (14-10)d = 4d
30 - 17 = 13 = 4d
13 = 4d
13/4 = d
0
what is the formula
It is not a formula... I found it myself