if a,b,c  are positive real  numbers such that ab2c3=64 then minimum value of 
1/a +2/b +3/c=?  (ans is 3)

Dear student
We have,ab2c3=64ab2c3=2×2×2×2×2×2ab2c3=22223On comparing, we geta=b=c=2Consider,1a+2b+3c=12+22+32=1+2+32=62=3is the required minimum value.
Regards

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