1.

If the line \[2x+3ay-1=0\] and \[3x+4y+1=0\] are mutually perpendicular, then the value of a will be      [MNR 1975]

A.            \[\frac{1}{2}\]    
B. 2
C.            \[-\frac{1}{2}\]  
D. None of these
Answer» D. None of these


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