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f:C rarr C is defined as f(x)=(ax+b)/(cx...

`f:C rarr C` is defined as `f(x)=(ax+b)/(cx+d), bd != 0` then f is a constant function when

A

`a = c`

B

`b=d`

C

`ad=bc`

D

`ab=cd`

Text Solution

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The correct Answer is:
C
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