Question

if 9th term of AP is zero then the ration of its 19th and 29th term is ?

Answer 1

a9=0
a9= a+8d= 0
a= -8d
a19 = a+18d = -8d+ 18d= 10d
a29= a + 28d= -8d+ 28d= 20d
a19/a29= 10d/20d= 1/2= 1:2

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Answer 2

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