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  4. If 19th term of a non-zero A.P. is zero, then its (49th term): (29th term) is :

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Q. If 19th term of a non-zero $A.P$. is zero, then its ($49th$ term) : ($29th$ term) is :

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Solution:

$a + 18d = 0$ ...(1)
$\frac{a+48d}{a+28d} = \frac{-18d+48d}{-18d+28d} = \frac{3}{1}$