(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 notes in hindi quiz book 324