mathn

9MathQ01-3,5
Chapter 1
Sets and Functions
Exercise 1.1

1. Write each of the following sets (i) in set builder form (ii) in listing its elements.
   (1) The set N of natural numbers.
   (2) The set J of all positive integers.
   (3) The set P of all prime numbers.
   (4) The set A of all positive integers that lie between 1 and 13.
   (5) The set B of real numbers which satisfy the equation 3x2 + 5x – 2 = 0.
2. Choose a suitable description (a) of (b) or (c) in set builder form for the following sets.
   (1) E ={ 2, 4, 6, 8}
   (a) E = { x/ x is an even integer less than 10 }
   (b) E = { x/ x is an even positive integer less than 10 }
   (c) E = { x / x is positive integer, x< 10 and x is a