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The consecutive AP terms are (-17,z,23). What are (z) and the common difference?

Answer and explanation

Correct answer: (z=3,d=20)

The middle term is the average of the extremes, so (z=\frac{-17+23}{2}=3) and (d=20). In exams, handle signs carefully when averaging negatives.

Related tags

ApMissing Middle TermNegative NumbersIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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