`A = 1/(2^2) + 1/(3^2) + 1/(4^2) + .................... + 1/(2018^2)`
` = 1/(2.2) + 1/(3.3) + 1/(4.4) + ................ + 1/(2018.2018)`
` < 1/(2.2) + 1/(2.3) + 1/(3.4) + .................. + 1/(2017.2018)`
` < 1/4 + 1/2 - 1/3 + 1/3 - 1/4 + ......................... + 1/2017 - 1/2018`
` < 3/4 - 1/2018 < 75% - 1/2018`
`⇒ A < B`