Maths (278 × 287 + 269 × 269 - 2 × 287 × 269) = ?

(278 × 287 + 269 × 269 - 2 × 287 × 269) = ? - - (278 × 287 + 269 × 269 - 2 × 287 × 269) = ?  Maths in hindi,  number system  446 question answers in hindi pdf   354 questions in hindi, Know About 534 Maths online test Maths MCQS Online Coaching in hindi quiz book     324