Question

Calculate the average of the cubes of first 5 natural numbers

• A. 55
• B. 65
• C. 45
• D. 35

Answer 1

Answer:

C. 45

Average of the cubes of 1st 'n' natural numbers =n(n+1)²/4 = 5(5+1)²/4 = 5 x 9 = 45