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Class 9 Mathematics Sequences and Progressions Geometric ProgressionExpert

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If (a_1=4) and the sum of the first (5) terms is (484), and (r) is a positive integer, what is (r)?

Answer and explanation

Correct answer: (3)

For (r=3), the terms are (4,12,36,108,324) and the sum is (484). For small options, forming the terms is quick.

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

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