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In a game (20) points are earned at the first level and each next level gives (6) more points. How many points will be earned at the (18)th level?

Answer and explanation

Correct answer: 122

The scores form an arithmetic progression with first term \(a=20\), common difference \(d=6\), and \(n=18\). The nth term is \(a_n=a+(n-1)d\). Therefore, \(a_{18}=20+(18-1)\times6=20+102=122\). Hence, 122 points are earned at the 18th level. Getting 120 usually results from using the wrong number of intervals. Exam tip: for the nth term, add \(n-1\) common differences, not \(n\).

Related tags

Arithmetic ProgressionNth TermAp FormulaWord ProblemClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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