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Question
Given that the ath, bth and cth term of an Arithmetic Progression are in Geometric Progression, then common ratio of that GP is?
Options:
A .  b-a
B .  a+b        
C .  c−bb−a
D .  c-1
Answer: Option C
:
C
Assume a GP, 1, 2, 4 with common ratio =2
Assume an AP with common difference 1 = 1, 2, 3, 4
Here ath,bth and cth term is 1,2 and 4
Look in the answer options where you get answer 2 after substitution

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