Book Maths Puzzle Numerical Ability Log and Antilog

if log242=a, log80=b, log45=c then
express log66 in terms of a,b,c .

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Book Other Question

Let there is a four digit number ABCD when multiplied by 4 its digit reversed in order of DCBA.Then what is the digit ABCD? Find the successive term of the following series.
5,8,13,21,34,........