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Find the (25)th term of the AP (1,6,11,16,\ldots).

Answer and explanation

Correct answer: 121

In this arithmetic progression, the first term is \(a=1\) and the common difference is \(d=6-1=5\). Using \(a_n=a+(n-1)d\), we get \(a_{25}=1+(25-1)\times5=1+120=121\). The distractor 126 results from the common mistake of multiplying the common difference by 25 instead of 24. Exam tip: always use \(n-1\) in the formula for the nth term.

Related tags

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

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