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Which arithmetic progression has first term (12) and common difference (6)?

Answer and explanation

Correct answer: (12,18,24,30,\ldots)

An arithmetic progression is identified by two details: its first term and the constant change from one term to the next. The required sequence must begin with 12, and every new term must be obtained by adding 6. Checking both conditions prevents confusion with a sequence that has the right difference but the wrong first term, or the right first term but a different difference.

In option A, the sequence begins 12, and its consecutive differences are \\(18-12=6\\), \\(24-18=6\\), and \\(30-24=6\\). Thus its first term is 12 and its common difference is 6. Option B begins with 6, option C increases by 12, and option D begins with 18. Therefore, option A is the only correct choice.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9EasyArithmetic ProgressionSequences And ProgressionsMathematics

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