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What is the (25)th term of the AP (100,97,94,91,\ldots)?

Answer and explanation

Correct answer: 28

In this AP, the first term is \(a=100\) and the common difference is \(d=97-100=-3\). The \(n\)th term is given by \(a_n=a+(n-1)d\). Therefore, \(a_{25}=100+(25-1)(-3)=100-72=28\). Hence, 28 is correct. Getting 30 may result from using an incorrect number of common differences instead of 24. Exam tip: for the \(n\)th term, always use \(n-1\) differences.

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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