यदि x * y = x² + y² + xy + 1 हो तो (1 * 2) * 3 = ? - - Yadi x * y = x& # 178 + y& # 178 + xy + 1 Ho To (1 * 2) * 3 = ? Maths in hindi, simplification 19 question answers in hindi pdf 82 questions in hindi, Know About 6 Maths online test Maths notes in hindi quiz book 98