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If the (10)th term of the AP (x, x+4, x+8,\ldots) is (50), what is the value of (x)?

Answer and explanation

Correct answer: 14

Here, the first term is \(a=x\) and the common difference is \(d=4\). Using \(a_n=a+(n-1)d\), we get \(50=x+(10-1)\times4=x+36\). Hence, \(x=14\). If 16 were chosen, the 10th term would be \(16+36=52\), not 50. Exam tip: In the nth-term formula, use \(n-1\), not \(n\).

Related tags

Arithmetic ProgressionNth TermCommon DifferenceAlgebraClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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