If α , β ,γ are the roots of x3+px2+q=0 where q ≠ 0 and Δ=1/α 1/β 1/γ1/β 1/γ 1/α1/γ 1/α 1/β then ∆ equal
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a
– p/q
b
1/q
c
p/q
d
0
answer is D.
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Detailed Solution
We have βγ+γα+αβ=0 . We can write ∆asΔ=1α3β3γ3βγγααβγααββγαββγγα=1α3β3γ3βγ+γα+αβγααβγα+αβ+βγαββγαβ+βγ+γαβγγα [using C1→ C1 + C2 + C3]=1α3β3γ30γααβ0αββγ0βγγα=0 [all zero property]