Cho A = 1/2^2 + 1/3^2 + ... + 1/100^2, Cho A = 1/2^2 + 1/3^2 + ... + 1/100^2, Cho A = 1/2^2 + 1/3^2+...+1/100^2, Cho A= 1/(2 ^ 2) + 1/(3 ^ 2) +...+ 1 100^ 2