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If (a=1) and (d=11), what is the (9)th term?

Answer and explanation

Correct answer: 89

The nth term of an arithmetic progression is \(a_n=a+(n-1)d\). Thus, \(a_9=1+(9-1)\times11=1+88=89\). Therefore, 89 is correct. A common error is choosing 88 by forgetting to include the first term; only 8 common differences are added to reach the 9th term. Exam tip: always use \((n-1)\), not \(n\), in the nth-term formula.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceClass 10 MathematicsAp FormulaFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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