alleryWhich of the following is an AP?
A3, 7, 11, 15, …
B5, 10, 20, 40, …
C2, 4, 8, 16, …
D1, 4, 9, 16, …
Answer & Solution
Correct answer: A. 3, 7, 11, 15, …
Compute consecutive differences.
Only option B has the same difference each time (4).
The others are a GP, perfect squares, and another GP, respectively.
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