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Q.

Let a,b,c be three distinct positive real numbers ab1 such that (2a)logea=(bc)logebandbloge2=alogec  Then 6a+6bc is equal to

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answer is 9.

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Detailed Solution

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Given equation  (2a)lna=(bc)lnb

lna×ln(2a)=ln(b).ln(bc)             lna(ln2+lna)=lnb.(lnb+lnc)              lna=x,lnb=y,lnc=z,xyz       x(ln2+x)=y(y+z)            xln2=y2x2+yz

Similarly from second equation
 ln2.lnb=lnc.lna       ln2=xzy
Substitute eq(ii) and eq(i)
We get,
y3yx2+y2z=x2z         y2(y+2)x2(y+z)=0         (xy)(x+y)(y+z)=0          xy(x+y)(y+z)=0         y=z

But  ln2=xzy

ln2=xz(z)          ln2=x=lna       a=12          y=z      lnb=lnc      lnb+lnc=0        bc=1        6a+6bc=6(12)+6(1)=9

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