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Average of first five multiples of 3 is:

  • A.9
  • B.11
  • C.13
  • D.15

Answer: A

The first five multiples of 3 are 3, 6, 9, 12 and 15 - equally spaced, so the average is the middle one.

\[ \frac{3 + 15}{2} = 9 \]

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