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In the AP (56,73,90,\ldots), how many terms are less than (1500)?

Answer and explanation

Correct answer: 85

Here, the first term is 56 and the common difference is 17. Therefore, \(a_n=56+17(n-1)\). Using \(a_n<1500\), we get \(56+17(n-1)<1500\), so \(n-1<84.94\ldots\). Hence, the greatest integer value of n is 85. In fact, \(a_{85}=1484\), whereas \(a_{86}=1501\), which is not less than 1500. Exam tip: For “less than,” do not include a term equal to the limiting value.

Related tags

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

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