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If in an AP (a_{18}=130) and (d=8), what is (a_4)?

Answer and explanation

Correct answer: 18

For two terms of an AP, \(a_{18}=a_4+(18-4)d\). Therefore, \(a_4=130-14\times 8=130-112=18\). Hence, 18 is correct. Option 20 is close, but adding 14 common differences to it gives \(a_{18}=132\), not 130. Exam tip: to find an earlier term from a later term, subtract the position gap multiplied by \(d\).

Related tags

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

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