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If (a,b,c) are in an arithmetic progression and (a=4), (c=22), what is (b-a)?

Answer and explanation

Correct answer: 9

In an arithmetic progression, the difference between consecutive terms is constant. Therefore, for three terms, the middle term b is the average of a and c: \(b=\frac{a+c}{2}=\frac{4+22}{2}=13\). Hence, \(b-a=13-4=9\). Option 11 can result from using an incorrect difference instead of halving \(c-a=22-4\). Exam tip: For three consecutive AP terms, the middle term is always the average of the first and third terms.

Related tags

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

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