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Q.

α,β be the roots of x2-3x+a=0 and γ,δ betheroots of x2-12x+b=0 and numbers α,β,γ,δ (in order)  form an increasing G.P. then

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a

a=3, b=12

b

a=12, b=3

c

a=2, b=32

d

a=4, b=16

answer is C.

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Detailed Solution

α+β=3;αβ=a; γ+δ=+12;γδ=bα,β,γ,δ are in increasing GPβ=αx,γ=αx2,δ=αx3α+β=α+αx=3=α(1+x)γ+δ=αx2+αx3=12=αx2(1+x) Divding 312=α(1+x)αx2(1+x) or 14=1x2 or x=2⇒β=2α and α+2α=3⇒α=1 and β=2∴a=αβ=2γ=αx2=1×22=4;δ=αx3=1×23=8∴b=γδ=4×8=32
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