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=?a191919b505050c404040d112112112ব্যাখ্যাFrom a2+b2+c2=(a+b+c)2−2(ab+bc+ca)a^2+b^2+c^2=(a+b+c)^2-2(ab+bc+ca)a2+b2+c2=(a+b+c)2−2(ab+bc+ca), substitute the values: 92−2(31)=81−62=199^2-2(31)=81-62=1992−2(31)=81−62=19.