KA-0172●●○4 points, difficulty 2 of 34 ptLevel 11–12not yet calibratedA committee of 4 must be formed from 5 boys and 4 girls, and it must contain exactly 2 boys and 2 girls. How many different committees are possible?CNT-06Selections of a few objectsalso CNT-04, CNT-16
KA-0173●●○4 points, difficulty 2 of 34 ptLevel 11–12not yet calibratedEach of the four edges of a square is painted either black or white. Two paintings count as the same if one can be rotated onto the other. How many genuinely different paintings are there?CNT-15Counting up to symmetryalso CNT-04, LOG-11
KA-0174●●○4 points, difficulty 2 of 34 ptLevel 11–12not yet calibratedA driver travels from one town to another at an average of 60 km/h and returns along the same road at an average of 40 km/h. What is the average speed for the whole journey?MOD-03Rate, time, distancealso MOD-08, CFT-11