CUET Preparation Today
CUET
General Test
Numerical Ability
Average
Find the average of squares of natural numbers till 7.
15
20
35
40
Average of squares = \(\frac{( x+1)(2x+1)}{6}\)
= \(\frac{(7+1)(2×7+1)}{6}\)
= \(\frac{(8×15)}{6}\)
= 20
