287 × 287 + 269 × 269 - 2 × 287 × 269 = ?
ক
534
খ
446
গ
354
ঘ
324
সঠিক উত্তর: 324
$$\eqalign{ & \left( {287 \times 287 + 269 \times 269 - 2 \times 287 \times 269} \right) \cr & = {\left( {287} \right)^2} + {\left( {269} \right)^2} - \left( {2 \times 287 \times 269} \right) \cr & = {\left( {287 - 269} \right)^2} \cr & = {\left( {18} \right)^2} \cr & = 324 \cr} $$