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Calculate the average of the cubes of first five natural numbers.

Correct Answer: 45

Explanation:

As per the formula,
Average of the cubes os 1st 'n' natural numbers= n(n+1)2/4
where, n= 5.
∴ Required average = 5(5+1)2/4
= (5 x 36)/4 = 5 x 9= 45


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