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What is the common difference in the sequence (6, 13, 20, 27, …)?

Answer and explanation

Correct answer: 7

The governing concept is the common difference of an arithmetic progression. It is the constant amount found by subtracting one term from the next. Compute the differences: 13 − 6 = 7, 20 − 13 = 7, and 27 − 20 = 7. Because all checked consecutive differences are equal, the sequence follows an arithmetic pattern and its common difference is 7. Therefore, option C is correct. Option D, 13, is the second term rather than the change between terms. Options A and B do not equal the difference between any consecutive pair in the sequence. Checking several pairs is important because it confirms that 7 is a constant difference, not merely a result from one isolated subtraction.

Related tags

Arithmetic ProgressionCommon DifferenceSequencesConstant DifferenceNth TermArithmetic ProgressionSequences And ProgressionsMathematics

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