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In an exam the first question carries (4) marks and each next question carries (2) marks more. How many marks does the (12)th question carry?

Answer and explanation

Correct answer: 26

The marks form an arithmetic progression with first term \(a=4\), common difference \(d=2\), and \(n=12\). Thus, \(a_{12}=a+(n-1)d=4+(12-1)\times2=26\). The option 28 results from incorrectly using 12 increases instead of the 11 gaps before the 12th term. Exam tip: in the \(n\)th-term formula, add the common difference \(n-1\) times.

Related tags

Arithmetic ProgressionAp Word ProblemsNth TermSequenceClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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