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Class 10MathematicsArithmetic Progressions (AP)Finding the $n$th term of an APExpert
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If aₙ = 9n + c and a₈ = 101, what is r when a₅ᵣ = 344?

Answer and explanation

Correct answer: 7

Substituting n = 8 gives 101 = 9 × 8 + c, so c = 29. Then a₅ᵣ = 45r + 29 = 344, so 45r = 315 and r = 7.

Related tags

Arithmetic ProgressionsParameter And IndexFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions ApMathematicsClass 10 Mcq
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