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If (a=12), (d=5), and (n=6), what is the value of (a_n)?

Answer and explanation

Correct answer: 37

The formula for the nth term of an arithmetic progression is \(a_n=a+(n-1)d\). Thus, \(a_6=12+(6-1)\times5=12+25=37\). Hence, 37 is correct. The answer 42 results from incorrectly using \(n\) instead of \(n-1\). Exam tip: write \(n-1\) separately before substituting the values.

Related tags

Arithmetic ProgressionNth TermAp FormulaClass 10 MathematicsSequenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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