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Which of the following list of numbers is/are an Arithmetic Progression?

(A) 6, 12, 18, 24…

(B) 1, 3, 5, 7…

(C) -3, 3, -3, 3…

(D) 21, 18, 15…

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 1

A list is an AP when the difference between consecutive terms stays constant. (A) has d=6d = 6, (B) has d=2d = 2 and (D) has d=−3d = -3, so all three are APs. In (C) the differences alternate between 66 and −6-6, so it is not an AP.

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