1. Sets

Video:   Rewind to repeat.

              Pause to make note.

Exercise: 

 Q.1 State whether the following are well defined

        or not?
a. All the colors in the rainbow.
b. All the points that lie on a straight line.
c. All the honest members in the family.
d. All the consonants of the English alphabet.
e. All the tall boys of the school.
f. All the hardworking teachers in a school.
g. All the prime numbers less than 100.
h. All the letters in the word GEOMETRY

Q.2 Rewrite these sets in description and in set         

      builder method.

a) A = {a, e, i, o, u}

b) B = {3, 6, 9, 12, 15)

c) C = {5, 7, 11, 13}

d) D = { 1, 2, 4, 8}

Q.3 Rewrite these sets in listing method.

A)  N = { the natural numbers between 5 and 10 }

B)  A = { letters of the word 'MATHEMATICS' } 

C)  P = {x : x is a natural number, x < 9}

D)  Q = {y : y is an even number, y < 10}.

Q.4 On the basis of Q. 2 write the cardinal number  of each sets.

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Square Numbers

Check This Video First


Practice Work:

1. What is 10 squared?
     a) 20.  b) 100.  c) 200

2.  Which of the following is a square of 9?
      a) 81.  b) 3.   c) both of them

3. 11 multiplied by 11 is.....
      a) 11    b) 22.    c) 121

4. Which of the number has a square equal
        to itself.
      a) 1.    b) 2.    c) 3

5. RAM is thinking about a square number between
     2 and 50, which is also an odd number and factors
     of 50. What is that number ?
      a) 1.    b) 5.   c) 25

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