The 4 and 8 term of an A.P. are in the ratio 1:2 and
the 10th term is 30. Find the common difference and
the first

1 thought on “<br />The 4 and 8 term of an A.P. are in the ratio 1:2 and<br />the 10th term is 30. Find the common difference and<br />the first”

1. 4th and 8th term of an AP is in ratio 1:2.

   That is,

   a4:a8 = 1:2

   So,

   a+3d/a+7d = 1/2

   2(a+3d) = (a+7d)

   2a+6d=a+7d

   a=d

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