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Q.

If x denotes the greatest integer not exceeding x then fx defined by

fx=x       ifx<2x-1 if x2 is continuous in

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a

R

b

1, 3

c

[1, 2)  (2, 3]

d

[1, 3)

answer is B.

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Detailed Solution

fx=x :   x<2x-1 :   x2

At x=2, L H L= limx2- x=1

R H L=limx2+  x-1=2-1=1

L H L=R H L=fxf is continuous at x=2

Since [x] is continuous  in [1, 2]

x-1 is continuous [2,3]

fx is continuous in [1,3)

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