(a ) Find the values of k so that the equation `x^(2)= 2x (1+3k) +7 (3+2k) = 0 ` has real and equal roots. <br> (b ) If the roots of the equation `(q-r) x^(2) +(r-p)x +(p-q) = 0 ` are equal then show that p,q and r are in A. P .

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