A) \[k\ne 80\]
B) \[k=75\]
C) \[k\ne 65\]
D) \[k\ne 75\]
Correct Answer: B
Solution :
(b): Condition is \[\frac{{{a}_{1}}}{{{a}_{2}}}=\frac{{{b}_{1}}}{{{b}_{2}}}\ne \frac{{{c}_{1}}}{{{c}_{2}}}\] i.e. \[\frac{13}{65}=\frac{15}{k}\ne \frac{-3}{-6}\Rightarrow k=75\]and \[k\ne 30\] which is automatically true if \[k=75\]
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