Answers

2016-03-08T20:15:19+05:30
A+9d=57
a+14d=87
on simplyfyng we get 
-5d=-30
d=6
substuting d in any 1 value we get
a+9*6=57
a=57-54
a=3
A.P=3,9,15,21,27,33,39,45,51,57
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2016-03-08T21:21:40+05:30
3,9,15,21,27,33,39,45,51,57,63,.........
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