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If (21,18,q,12,\ldots) is an arithmetic progression, what is the value of (q)?

Answer and explanation

Correct answer: \(15\)

In an arithmetic progression, the difference between consecutive terms is constant. Here, the common difference is \(d=18-21=-3\). Therefore, the third term is \(q=18+(-3)=15\). Checking: \(15-3=12\), so \(21,18,15,12\) is correct. If \(14\) were used, the consecutive differences would not be equal. Exam tip: Find \(d\) from the first two terms and apply the same difference to obtain the next term.

Related tags

Arithmetic ProgressionCommon DifferenceMissing TermSequenceClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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