17. If the roots of the equation (a + 6%)x2 - 26(a + c) x + (6 + c) = 0 are equal,
then which one of the following is correct?
(a) 2b = a + c
(b) b2 = ac
(c) b + c = 2a
(d) b = ac
then which one of the following is correct?
(a) 2b = a + c
(b) b2 = ac
(c) b + c = 2a
(d) b = ac
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