a: \(\left(a,b\right)\in\left\{\left\{\left(1;75\right);\left(75;1\right);\left(3;25\right);\left(25;3\right);\left(5;15\right);\left(15;5\right)\right\}\right\}\)
b: \(\left(a,b\right)\in\left\{\left(1;36\right);\left(2;18\right);\left(3;12\right);\left(4;9\right)\right\}\)