the answer is D and the explanation is given in Italian below it. what is the logic behind it, I solved it the usual math way but the explanation shows smth else

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Hey!

Here we should find The number that is in the middle of all other numbersâ€¦ which is 67

in this case, the question says arithmetic mean isnâ€™t that sum of all/# of numbers pretty much the average?

Yes exactly â€¦

This question is asking medianâ€¦ so in my point of view itâ€™s wrong.

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Since the consecutive terms differ by constant quantity (+9), we just need to take the first and the last number, add them both and divide the sum of two by 2, to calculate the mean. So: 31+103=134, 134/2=67 What makes this question tricky is the order of the consecutive numbers.

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grazie per la traduzione

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