(1) 1
(2) 2
(3) 3
(4) 4
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(4) 4
log 11 to the base 3× log 13 to the base 11× log15 to the base 13 × log 27 to the base 15× log 81 to the base 27
= log 13 to the base 3× log 15 to the base 13× log27 to the base15× log81 to the base27
=log 15 to the base 3× log27 to the base 15× log 81 to the base 27
=log27 to the base 3× log 81 to the base 27
=log 81 to the base3
=log 3^4 to the base 3
=4×log 3 to the base 3
=4×1
=4
Formulae used
1. log b to the base a× log c to the base b= log c to the base a
2. log a to the base a=1
3. log b^c to the base a= b log c to the base a
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