CUET Preparation Today
CUET
General Test
Numerical Ability
Average
Find the average of cubes of natural numbers till 7. |
115 110 112 140 |
112 |
Sum of cube of n natural numbers = n2 × (n+1)(n+1)4 Here n = 7 Sum of cube of 7 natural numbers = 72 × (7+1)(7+1)4 = 784 Now, the average of cube of first 7 natural numbers= 7847 = 112 |