Ratio of 7th term and 3rd term is 12 /5 find other terms in ap
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7term /3rd term= a+ 6d/a+2d = 12/5
cross multiply
5a +30d =12a +24d
30d - 24d = 12a -5a
6d. = 7a
d =7a/6
a. = 6. and. d = 7
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