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Class 9MathematicsSequences and ProgressionsArithmetic ProgressionExpert
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What is the sum of the first (12) terms of the arithmetic progression (7,14,21,28,\ldots)?

Answer and explanation

Correct answer: (546)

The first and twelfth terms are (7) and (84), so the sum is (\frac{12(7+84)}{2}=546). Use the first and last terms for the sum.

Related tags

SequencesProgressionsArithmetic-ProgressionSumArithmetic ProgressionSequences And ProgressionsMathematicsClass 9 Mcq
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