If `a(p+q)^2+2b p q+c=0a b da(p+r)^2+2b p r+c=0(a!=0)` , then `q r=p^2` b. `q r=p^2+c/a` c. `q r=p^2` d. none of these

If a(p+q)^2+2bpq+c=0 and q(p+r)^2+2bpr+c=0 then (A) qr=p^2 + c/a (B) qr=p^2 - c/a (C) q+r = 2(a+b)/a (D) q+r= -2(a+b)/(a)

If p+q+r=0=a+b+c , then the value of the determnalnt |p a q b r c q c r a p b r b p c q a|i s 0 b. p a+q b+r c c. 1 d. none of these

If p > q and r < 0 , then which is true? (a) p r < q r (b) p r < q r (c) p + r < q + r (d) None of these

7. Let A= {p, q, r}. Which of the following is an equivalence relation on A?(a) R, = {(p, q), (q, r), (p, r), (p, q)} (b) R2 = {(1,9).(,p), (r,r). (9,7)} (c) Rz = {(p, p), (q,9), (r, r), (p, q)} (d) one of these