If the 11th term of an A.P. is zero, then the ratio of its 5th and 7th terms is
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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