Question

4 In the open interval (a, b), All the real numbers lying between 'a' and 'b'belong to the interval. Which of the following is true for the numbers 'a' and 'b'? (a) 'a' and 'b' belong to the interval (b) 'a' and 'b' do not belong to the interval (c) 'a' is included but 'b' is excluded in the interval (d) 'a' is excluded but 'b'is included in the interval 1
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Answer 1

Answer:

when it is open interval (a,b) the points a and b are not included in the domain, whereas in closed interval [a,b] the points a and b are included.. .. if you are getting confused then try using these notations for open ]a,b[ and for closed [a,b] so you would easily see that a and b are not actually included.. that is just a way to remember.. next time you see ( ) replace it by ] [.. all the very best