C-03-Q056mediumsingle_mcqIf a+b+c=9a+b+c=9a+b+c=9 and ab+bc+ca=31ab+bc+ca=31ab+bc+ca=31, a2+b2+c2=?a^2+b^2+c^2 = ?a2+b2+c2=?a191919b505050c404040d112112