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Find the relationship between a and b...

Find the relationship between a and b so that the function f defined by: `f(x)={a x+1b x+3\ \ \ \ \ \ "if"\ x\ lt=3"if"\ x >3`

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The correct Answer is:
`a-b= (2)/(3)`
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OSWAAL PUBLICATION-CONTINUITY AND DIFFERENTIABILITY-CONTINUITY ( LONG ANSWER TYPE QUESTIONS-I)
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