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If 6, h, 24 are in an arithmetic progression, what is h − 6?

Answer and explanation

Correct answer: 9

The governing concept is that consecutive terms of an arithmetic progression have equal differences. For three consecutive terms, the middle term is the average of the first and third terms. Thus h = (6 + 24) / 2 = 30 / 2 = 15. The required expression is h − 6, so h − 6 = 15 − 6 = 9. The same result can be obtained from the total change: 24 − 6 = 18, and this change is divided into two equal common differences, giving 18 / 2 = 9. Hence the sequence is 6, 15, 24 and option B is correct. Option C is the total change from the first term to the last, not the common difference or the requested expression.

Related tags

Arithmetic ProgressionCommon DifferenceMiddle TermIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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