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2015-07-19T13:08:27+08:00

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6th term = 4
100th term = 98

100th term - 6th term = (100-6)d = 94d
98 - 4 = 94 = 94d
94 = 94d
1 = d

55th term - 6th term = (55-6)d = 49d
55th term - 4 = 49d = 49
55th term = 53
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