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If in an AP (a_5=5x-2), (a_{11}=11x-20), and (a_{17}=17x-38), what is (a_{23})?

Answer and explanation

Correct answer: \(23x-56\)

The terms are six positions apart, so their differences must be equal. \(a_{11}-a_5=(11x-20)-(5x-2)=6x-18\), and \(a_{17}-a_{11}=6x-18\). Hence, \(a_{23}=a_{17}+(6x-18)=(17x-38)+(6x-18)=23x-56\). Therefore, option C is correct. Exam tip: When equally spaced AP terms are given, use the equal difference between those terms to find the next one.

Related tags

Arithmetic ProgressionNth TermAlgebraic ExpressionsClass 10 MathematicsAp TermsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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