Question
Question: The number of points of discontinuity of f(x) = [x<sup>3</sup> +1] in (1, 2) is/are...
The number of points of discontinuity of f(x) = [x3 +1] in
(1, 2) is/are
A
1
B
6
C
5
D
4
Answer
6
Explanation
Solution
1 < x < 2 ⇒ 1 < x3 < 8 ⇒ 2 < x3 + 1 < 9
[x3 +1] = 3, 4, 5, 6, 7, 8 ← 6 points are there.