JEE Main 2019 Mathematics question
Let a, b and c be the 7th, 11th and 13th terms respectively of a non-constant A.P. If these are also the three consecutive terms of a G.P., then is equal to:
Answer: (C)
Solution
⇒ A = −14d ⇒ a = −8d, c = −2d.
Let a, b and c be the 7th, 11th and 13th terms respectively of a non-constant A.P. If these are also the three consecutive terms of a G.P., then is equal to:
⇒ A = −14d ⇒ a = −8d, c = −2d.