Question

plzzz tell fast full solution

Answer 1

A+(p-1)D=a............(1)
A+(q-1)D=b............(2)
A+(r-1)D=c...............(3)

(2)-(3)
b-c=(q-1)D-(r-1)D
b-c=D(q-r)
p( b-c)=p D ( q-r).......(4)

similarly,
q(c-a)=q D (r-p)............(5)
and, r(a-b)=r D (p-q).....(6)

adding (4), (5) and (6),
we get
(a-b)r+(b-c)p+(c-a)q=0

hope it helps you
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