what is the average of first 29 even numbers?
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870 is the average of 1st 29 even numbers
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Average of the first 20 even numbers = (2+4+6 +…..40)/20; sum = n(n + 1)/2. 2 times (20)(21)/ 2 = 20 x 21 = 420; Average = 420/20 = 21.
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