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Question

Column 1 contains the equation for 4 different functions
Column 2 contains information about increasing/decreasing nature of f(x)
Column 3 contains information about the limiting behaviour of f(x) near 0 and at infinity
Column I Column 2 Column 3(I)f(x)=x2logx(i)f(x) has one point of minima(P)limxO+f(x)=0(II)f(x)=xlogx(ii)f(x) has one point of maxima(Q)limxf(x)=0(III)f(x)=logxx(iii)f(x) increases in(0,e)(R)limxf(x)=(IV)f(x)=xx(iv)f(x) decreases in(0,1e)(S)limxO+f(x)=1
Which of the following options is the only INCORRECT combination?

A
(IV)(iv)(S)
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B
(III)(iii)(Q)
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C
(II)(iv)(R)
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D
(I)(i)(P)
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Solution

The correct option is A (IV)(iv)(S)

f(x)=x2logx
f(x)=x(2logx+1)
x=1e

f(x)=xlogx
f(x)=1+logx
x=1e

f(x)=logxx
f(x)=1logxx2
x=e

f(x)=xx
f(x)=xx(1+logx)
x=1e



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