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What is the (22)nd term of the AP (1,8,15,22,\ldots)?

Answer and explanation

Correct answer: 148

For this AP, the first term is \(a=1\) and the common difference is \(d=8-1=7\). The \(n\)th term is given by \(a_n=a+(n-1)d\). Thus, \(a_{22}=1+(22-1)\times7=1+147=148\). Therefore, 148 is correct. A value such as 146 can result from counting the terms or the common difference incorrectly. Exam tip: for the \(n\)th term, use \((n-1)d\), not \(nd\).

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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