The entrance of a building is controlled by a code device (box), which has 10 numbers and 4 letters. A code has four elements: two digits and two letters in any order. The two letters must be distinct. How many possible codes is there ?

The operation is suck a c@ck? !

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c