Find the conditions, if the roots of the equation x3 - px2 + qx - r = 0 are in AP?
let the roots be a-d, a and a+d, then:
Sum of the roots = a-d + a + a+d = 3a = p ⇒ a = p/3
Since this value of a should satisfy the equation, so we put the value in equation and we get
Correct option is (b)
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