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If 12 and 20 are consecutive terms of an arithmetic progression with one arithmetic mean between them, which of the following is the arithmetic mean between them?

Answer and explanation

Correct answer: 16

The arithmetic mean of two numbers is their average: \((12+20)/2=16\). Thus the terms 12, 16, 20 have equal common differences of 4. Exam tip: for one middle AP term, take the average of the end terms.

Related tags

Arithmetic ProgressionArithmetic MeanSequencesCommon DifferenceClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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