Progressions-

If the 9th term of an A.P is zero, then ratio of the 29th term to the

19th term is?

A. 2:1

B. 3:1

C. 9:1

D. None of these

Solution:

t9 = a + (9 - 1)d

= a + 8d = 0

Therefore a = -8d

using above method, we get

t29 = 20d

t19 = 10d

therefore, the solution is 2:1

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