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  1. Calculate the average of the cubes of first five natural numbers.
    1. 55
    2. 65
    3. 45
    4. 35
    5. None of the above
Correct Option: C

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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