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In the AP (-12,-5,2,\ldots), what is the first term greater than (100)?

Answer and explanation

Correct answer: 107

Here, the first term is \(a=-12\) and the common difference is \(d=7\). Thus, \(a_n=-12+7(n-1)=7n-19\). For \(a_n>100\), we get \(7n-19>100\), so \(n>17\). The smallest integer value is \(n=18\), and \(a_{18}=107\). While 100 is the 17th term, the next AP term is 107. Exam tip: for “greater than,” solve the inequality and take the smallest valid integer value of \(n\).

Related tags

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

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