Bank Math Master১টি পরীক্ষায় এসেছেপ্রশ্ন ৬If 'x' is an odd number and 'y' is an even number, which one of the following must be an even number?কক) xy + 1খখ) x2 + y2গগ) (x + y)2 + 1ঘঘ) x + yউত্তর দেখুন