Discussion

Explanation:

Given that 11th term is zero

⇒ a + (11 – 1) d = 0

⇒ a + 10d = 0.

⇒ a = -10d

Now ratio of 5th and 7th terms =

a+4da+6d=-10d+4d-10d+6d=-6d-4d=32

Hence, option (d).
 

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