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Class 9 Mathematics Sequences and Progressions Arithmetic ProgressionExpert

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If (a_1=2) and the sum of the first (6) terms is (72), what is the common difference?

Answer and explanation

Correct answer: (4)

The first (6) terms sum to (72) for (2,6,10,14,18,22), so (d=4). For small (n), option checking is quick.

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Sequences Progressions Arithmetic-Progression Sum Arithmetic Progression Sequences And Progressions Mathematics Class 9 Mcq

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