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Q.

If x-3y=p, ax+2y=q and ax+y = r form a right angled triangle, then 

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a

a26a12=0

b

a29a+12=0

c

a29a+18=0

d

a26a18=0

answer is C.

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Detailed Solution

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If x3y=pand ax+2y=qare perpendicular then (13)(a2)=1a=6

If x3y=pand ax+y=r are perpendicular then (13)(a)=1a=3

ax+2y=q and ax+y=r cannot be perpendicular as (a2)(a)=1a2=2 

 (not possible) thus  a=6  or  a=3  or  a29a+18=0

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