Final Cover - For Printing

The idea of element may be explained to the child orally with adequate examples.

3. Well Defined Set
   A set in which the elements can be listed out is said to be a well defined set.
   Eg. : A = { Pen , Pencil}
   Here, both the elements of the set A, namely, pen and pencil are writing devices and
   they can be listed out and hence they are elements of a well defined set.

The child could be taught the concept orally in addition to the provision of the

elements which are well defined as in the case of pen and pencil.

4. Not well defined set
   A set in which the elements cannot be listed out is said to be a set, not well defined.
   Eg. : B = {Intelligent pupils in Class X}
   Unless the expression ‘Intelligent’ is linked to a numerical value or some definite
   measure, the elements of the set cannot be listed, and hence the set is not well
   defined.

The child with visual impairment can be taught the concept orally. If necessary few

other terms which are not well defined such as beautiful, soft, courteous, etc., can

also be given and the child be assisted to understand the concept clearly.

5. Equal Sets
   Two sets A and B are said to be equal if they have exactly the same elements, and is
   denoted as A = B.

Eg. :A = {1, 2, 3}

B = {3, 2, 1}

To enable the child to understand the concept, two pairs of identical objects, say, a

slate, stylus and abacus be given to explore. Explain the concept orally supported by

the concrete materials to enable the child to understand the concept of equal sets.