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In the AP (121,109,97,\ldots), which is the last term greater than (-75)?

Answer and explanation

Correct answer: (-71)

Here, the first term is \(a=121\) and the common difference is \(d=-12\). Thus, \(a_n=121-12(n-1)\). We get \(a_{17}=-71\), and the next term is \(a_{18}=-83\). Since \(-71>-75\) but \(-83<-75\), the last term greater than \(-75\) is \((-71)\). \((-83)\) is a close distractor, but it is less than \(-75\). Exam tip: In a decreasing AP, check the two consecutive terms on either side of the given limit.

Related tags

Arithmetic ProgressionNth TermDecreasing ApInequalitiesClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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