Question
What is the average of the first 20 multiples of
12?Solution
ATQ, Multiples of 12 = 12, 24, 36, 48, ... Sum of the first 20 multiples of 12: 12+24+36+…=12×(1+2+3+…+20) Using the formula for the sum of the first 20 natural numbers: 
Thus, the average is 126 .
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