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If a geometric progression has (a_2=28) and (r=4), what is (a_1)?

Answer and explanation

Correct answer: 7

In a geometric progression, the second term is \(a_2=a_1r\). Thus, \(28=a_1\times4\), so \(a_1=28\div4=7\). Multiplying 28 by 4 gives 112, which would be the next term \(a_3\), not the first term. Exam tip: To find a previous term in a GP, divide by the common ratio.

Related tags

Geometric ProgressionCommon RatioFirst TermSequencesGrade 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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