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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