A) ? 1
B) 0
C) 1
D) None of these
Correct Answer: A
Solution :
\[f(x)\] is continuous at every point of its domain, Þ\[\underset{x\to {{1}^{-}}}{\mathop{\lim }}\,f(x)=\underset{x\to {{1}^{+}}}{\mathop{\lim }}\,f(x)=f(1)\] Þ \[5\times 1-4=4\times 1+3\times b\times 1\] Þ \[1=4+3b\] Þ \[3b=-3\] Þ \[b=-1\].
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