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A machine produces (15) more items each hour. The production is (20,35,50,65,\ldots). What is the difference between the third and first terms?

Answer and explanation

Correct answer: 30

The AP is 20, 35, 50, 65, \ldots, where \(a_1=20\) and \(a_3=50\). Therefore, \(a_3-a_1=50-20=30\). The common difference is \(d=15\), but the difference between the first and third terms is \(2d=30\), so 15 is not correct. Exam tip: When asked for the difference between two terms, subtract the stated terms directly to verify your answer.

Related tags

Arithmetic ProgressionCommon DifferenceTerm DifferenceAp BasicsClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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