The set of all points of discontinuity of f(x)=x−1x3+6x2+11x+6 is
A
ϕ
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B
{−1}
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C
{−1,−2,−3}
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D
{1,2,3}
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Solution
The correct option is C{−1,−2,−3} f(x)=x−1(x+1)(x+2)(x+3) Discontinuity occurs at the point where the function f(x) is not defined which is at x=−1,−2,−3.