(a)
Collect pieces of different kinds of paper .Find out which of these cn be recycled.

(a) Collect different kinds of packaging material. What was the purpose for which each one was used ?Discuss in groups.

Find out the pairs, which are correctly matched.

From the prices of shares X and Y below, find out which is more stable in value :

There are p copies each of n different books. Find the number of ways in which a nonempty selection can be made from them.

A piece of paper is in the form of rectangle ABCD in which AB=18cm,BC=14 cm. With BC as the diameter, a semicircle portion of the paper is cut .Find the area of the rest of the piece of paper.

Iron forms a many complexes in its +2 and +3 oxidation states such as [Fe(H_2O)_6]^(2+) (A), [Fe(CN)_6]^(4-) (B), [Fe(H_2O)_6]^(3+) (C), [Fe(CN)_6]^(3-)(D) , etc. They exhibit different magnetic properties and undergo different hybridisation of iron. Which of the following statements is wrong ?

A person is permitted to select at least one and at most n coins from a collection of (2n+1) distinct coins. If the total number of ways in which he can select coins is 255, then find the value of n.