Maths

In an A.P ratio of 3rd term and 5th term is 3:7.
a)Find the ratio of the 4th and 6th term?
b)Find the ratio of the 6th and 12th term?

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asked by Liji
  1. 1 a
    2 a+d
    3 a+2d
    4 a+3d
    5 a+4d

    n a + (n-1)d

    (a+2d)/(a+4d) = 3/7

    3 a + 12d = 7a + 14 d
    4a=-2d
    d = -2a

    fourth/sixth (a+3d)/(a+5d)
    = (a-6a)/(a-10a)
    = -5a/-9a
    = 5/9
    etc

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    posted by Damon

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