For a sports meets, a winner's stand comprising of three wooden blocks is in the form as shown in figure. There are six different colours available to choose from and three of the wooden blocks is to be painted such that no two of them has the same colour. Find the probability that the smallest block is to be painted in red, where red is one of the six colours.

Three students A,B,C stand one behind other in a row to take a part in a march -past.There are 5 different colour flags are there. Each student is to carry a flag such that on two students should carry the flag of the same colour.Find the probability that the first student should carry white flag where white is one of the 5 colours.

Three balls are to be chosen from a box contaning 3 red ,2 white and 4 blue balls.Find the probability that all the three balls are of different colour.

An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colour is

Take three different colour sheets , place one over the other and draw a triangle on the top sheet. Cut the sheets to get triangles of different colour which are identical. Mark the vertices and the angles as shown. Place the interior angles angle1,angle2 and angle3 on a straight line, adjacent to each other, without leaving any gap. What can you say about the total measure of the three angles angle1,angle2 and angle3 ? Can you use the same figure to explain the ''Exterior angle property'' of a triangle ? If a side of a triangle is stretched, the exterior angle so formed is equal to the sum of the two remote interior angles.