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Q.

Let [t] denote the greatest integer t and limx0x4x=A. Then the function, f(x)= [x2 ]sinπx is discontinuous, when x is equal to :

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a

A+5

b

A+1

c

A

d

A+21

answer is C.

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Detailed Solution

A=limx0x4x=limxzx4x-4x =limx04-x4x=4-0=4 A=4 f(x)=[x2] sin πx is discontinuous at non integer values of x If x=A+1=5, then f(x) is discontinuous

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