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What is the average of first 15 multiples of 12?
- A96
- B66
- C1440
- DNone of these
Answer not set
Discussion 1
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CCommunity
First 15 multiples of 12 are 12, 24, 36… 180
⇒ Sum of all multiples = 12 + 24 + 36 + ... + 180 = 12(1 + 2 + 3 + … + 15) = 12 × 120 = 1440
∴ Average = 1440/15 = 96
⇒ Sum of all multiples = 12 + 24 + 36 + ... + 180 = 12(1 + 2 + 3 + … + 15) = 12 × 120 = 1440
∴ Average = 1440/15 = 96