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0 votes
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in Arithmetic Progression by (53.5k points)

If the roots of x3 – 12x2 + 39x – 28 = 0 are in A.P, then their common difference will be

(a) ± 1

(b) ± 2

(c) ± 3

(d) ± 4

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1 Answer

+1 vote
by (53.3k points)

Correct option is (c) ± 3

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