If p,x1,x2,x3...... and q,y1,y2,y3.... form two infinite APs with common difference a and b respectively, then the locus of a point Z(M,N) where M=(1/n)[x1 + x2 + x3 +...+ xn] and N=(1/n)[y1 + y2 + y3 +....+ yn] is is
A) a(x-p)=b(y-q)
B) p(x-a)=b(y-q)
C) p(x-p)=b(y-q)
D) b(x-p)=a(y-q)
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