Answers

2014-06-22T14:14:08+05:30
Let a1,a2,a3 ,.........,a7 are in a.p. whose common difference is d
a4 = 3a1
a1 + 3d = 3a1
3d = 2a1
a7 = 2a3 + 1
a1 + 6d = 2a1 + 4d + 1
2d = a1 + 1
4a1/3 = a1 + 1
a1 = 3
d = 2

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