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If the first term of an AP is (5) and common difference is (3), what is the (8)th term?

Answer and explanation

Correct answer: 26

The formula for the nth term of an AP is \(a_n=a+(n-1)d\). Here, \(a=5\), \(d=3\), and \(n=8\), so \(a_8=5+(8-1)\times3=5+21=26\). Therefore, 26 is correct. Choosing 23 results from an incorrect count of differences: there are 7 common differences after the first term to reach the 8th 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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