if the roots of the equation px? +qx r 0, where 2p, a, 2r are in G,P, are of the form 5 a 2,4k 4. Then the value of 2p 4q +7r is (a) (b) 10 (c) 14 (d) 18 15. Let xi, x2, x3,...... xt be the divisors of positive integer n (including 1 and n)