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In the AP (169,154,139,\ldots), what is the first term less than (40)?

Answer and explanation

Correct answer: 34

The common difference is \(d=154-169=-15\). The terms around the boundary are \(49, 34, 19,\ldots\). Since \(49\) is not less than \(40\), but the very next term \(34\) is less than \(40\), the first required term is \(34\). Exam tip: In a decreasing AP, write the consecutive terms around the given boundary to identify the first qualifying term.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceDecreasing SequenceClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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