# 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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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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