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What is the greatest term less than (100) in the AP (1,4,7,\ldots)?

Answer and explanation

Correct answer: 97

Here, the first term is 1 and the common difference is 3, so the nth term is \(a_n=1+3(n-1)=3n-2\). From \(3n-2<100\), we get \(n<34\); hence the greatest integral value of n is \(33\). Therefore, \(a_{33}=97\). Although 99 is less than 100, it is not a term of this AP because the terms increase by 3 from 1. Exam tip: write \(a_n<\) the given number and find the greatest possible integer value of n.

Related tags

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

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