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The equations `ax+by+c=0` and `dx+ey+f=0` represent the same straight line if and only if

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The equations `ax+by+c=0` and `dx+ey+f=0` represent the same straight line if and only if
A. `(a)/(d)=(b)/(e)`
B. c=f
C. `(a)/(d)=(b)/(e)=(c)/(f)`
D. a=d, b=e, c=f
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Correct Answer - C
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