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In the AP (221,204,187,\ldots), what is the first term less than (50)?

Answer and explanation

Correct answer: 34

The first term is 221 and the common difference is \(d=204-221=-17\). The terms decrease as \(\ldots,68,51,34,17,0\). Since 51 is greater than 50 and the very next term, 34, is less than 50, the required first term is 34. Although 17 is also less than 50, it is not the first such term. Exam tip: In a decreasing AP, check the consecutive terms immediately on either side of the given limit.

Related tags

Arithmetic ProgressionNth TermDecreasing ApCommon DifferenceInequalitiesFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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