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Class 10MathematicsArithmetic Progressions (AP)Finding the $n$th term of an APExpert
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If aₙ = 11n + c and a₉ = 128, what is r when a₄ᵣ = 381?

Answer and explanation

Correct answer: 8

Using a₉ = 128 gives 11 × 9 + c = 128, so c = 29. Then a₄ᵣ = 44r + 29 = 381, so 44r = 352 and r = 8.

Related tags

Arithmetic ProgressionIndex ParameterFinding 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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