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In a poster design, the first row has (9) stars and each next row has (3) more stars. How many stars are in the (10)th row?

Answer and explanation

Correct answer: 36

The numbers of stars form an arithmetic progression with first term 9 and common difference 3. The 10th term is \(a_{10}=a+(10-1)d=9+9\times3=36\). Therefore, the correct answer is 36. The value 39 would be the 11th term, not the 10th term. Exam tip: use \(a_n=a+(n-1)d\) to find the \(n\)th term of an AP.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermClass 10 MathematicsCommon DifferenceWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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