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What is the (16)th term of the AP (200,190,180,170,\ldots)?

Answer and explanation

Correct answer: 50

In this AP, the first term is \(a=200\) and the common difference is \(d=190-200=-10\). Using \(a_n=a+(n-1)d\), we get \(a_{16}=200+(16-1)(-10)=200-150=50\). Hence, 50 is correct. Choosing 60 would count only 14 differences, whereas there are 15 differences from the first term to the 16th term. Exam tip: always use \(n-1\) in the nth-term formula and keep track of a negative common difference.

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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