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In an AP, (a_1+a_2=33) and (d=5). What is (a_{12})?

Answer and explanation

Correct answer: 69

In an AP, \(a_1=a\) and \(a_2=a+d\). Hence, \(a_1+a_2=a+(a+5)=33\), so \(2a=28\) and \(a=14\). Therefore, \(a_{12}=a+11d=14+11\times5=69\). Choosing 71 would result from using the number of terms or the common difference incorrectly. Exam tip: while finding the \(n\)th term, use \(a_n=a+(n-1)d\), ensuring that the multiplier is \(n-1\).

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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