AFCAT Model Paper 7

Formula Used:
The sum of cubes of the first ' n ' odd numbers =n2(2n2−1)
Calculation:
We have to find the value of 13+33+53+ +293
According to the formula used
⇒ 152(2×152−1)
⇒ 225 × (450 – 1)
⇒ 225 × 449
Now, Required average =

(225×449)

15

⇒ 6735
∴ The required average is 6735.