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If (a=15) and (d=-4), what are the first four terms?

Answer and explanation

Correct answer: (15, 11, 7, 3)

In an AP, the first term is \(a=15\) and the common difference is \(d=-4\). Therefore, subtract 4 to get each next term: \(15,\;15-4=11,\;11-4=7,\;7-4=3\). Hence, the first four terms are \((15, 11, 7, 3)\). Option D starts from 11, so it omits the first term. Exam tip: a negative \(d\) means that the terms decrease.

Related tags

Arithmetic ProgressionCommon DifferenceFirst TermsClass 10 MathematicsAp BasicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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