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What is the common difference of the sequence (3a, 3a + 2b, 3a + 4b, 3a + 6b, …)?

Answer and explanation

Correct answer: 2b

The defining property of an arithmetic progression is that subtracting each term from the next gives the same constant. Calculate the first difference: (3a + 2b) − 3a = 2b. The next differences confirm the pattern: (3a + 4b) − (3a + 2b) = 2b and (3a + 6b) − (3a + 4b) = 2b. Thus the common difference is 2b, so option C is correct. The repeated expression 3a is a fixed part of every term and cancels whenever consecutive terms are subtracted; it is not the common difference. Similarly, b alone is not correct because the coefficient 2 is part of the change. The conclusion follows symbolically and does not require particular numerical values for a or b.

Related tags

Arithmetic ProgressionCommon DifferenceAlgebraic SequenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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