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Rational Numbers between Two Rational Numbers

What is the a...

Question

What is the average of first 12 multiples of 9?

A

49

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B

48.50

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C

58.50

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D

48

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E

50

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Solution

The correct option is C
58.50

Average $= \frac{9 (1 + 2 + 3 \dots + 10 + 11 + 12)}{12} = 58.50$

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