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If the (4)th term of an AP is (15) and the (12)th term is (55), what is the (16)th term?

Answer and explanation

Correct answer: 75

Given \(a_4=15\) and \(a_{12}=55\). Thus, \(a_{12}-a_4=8d\), so \(55-15=8d\) and \(d=5\). Now \(a_{16}=a_{12}+4d=55+4\times5=75\). Therefore, 75 is correct. The nearby option 80 would result from adding \(5d\) instead of the required \(4d\). Exam tip: use the difference between the term numbers to determine how many common differences are involved.

Related tags

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

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