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Q.

x=logee+logex,x>1, where . and . denote the greatest integer function and the fractional part function, respectively, then

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a

⨍(x) is continuous but non differentiable at x = e

b

⨍(x) is differentiable at x = e

c

⨍(x) is discontinuous but differentiable at x = e

d

⨍(x) is discontinuous at x = e

answer is A.

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Detailed Solution

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⨍(e)=logee+logee=1+1=+0=1   R.H.L=(e+)=logee++logee+=Lth01+h+1+h=1+0=1   L.H.L=(e-)=logee-+logee-=Lth01-h+1-h=0+1=1 L.H.L=R.H.L=fe⨍(x) is contineous at x=e Now1e+=Lth0⨍(e+h)-⨍(e)h =Lth01+h+1+h-1h=Lth01+h-1h=Lth01h→∞ ⨍(x) is non differentiable at x=0

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