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The 9th term of an A.P is three times the 5th term. Is it true or false that the 8th term is five times the 4th term.

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a+8d = 3(a+4d)
a+8d = 3a+12d
-2a = 4d
a = -2d
so, is
a+7d = 5(a+3d) ?
Substitute from the first equation and find out.

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