`E = 1^2 + 2^2 + 3^2 + .....+ 99^2 + 100^2`
`E = 1 + 2.(1 + 1) + 3.(2 + 1) +.......+ 99.(98 + 1) + 100.(99 + 1)`
`E = 1 + 1 . 2 + 2 +.....+ 98 . 99 + 99 . 100 + 100`
`E = (1 + 2 + 3 + ..... + 100) + (1 . 2 + 2 . 3 + ....... + 99 . 100)`
`E = 333300 + 5050`
`E = 338350`