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The sequence (18, 18-c, 18-3c) is an arithmetic progression. What is the correct conclusion about (c)?

Answer and explanation

Correct answer: \(c=0\)

In an arithmetic progression, consecutive differences must be equal. Here, second term − first term is \((18-c)-18=-c\), while third term − second term is \((18-3c)-(18-c)=-2c\). Therefore, \(-c=-2c\), which gives \(c=0\). For \(c=1\) or \(c=3\), the two differences are not equal. Exam tip: For three terms to be in AP, equate their two consecutive differences.

Related tags

Arithmetic ProgressionCommon DifferenceLinear EquationsClass 10 MathematicsSequenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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