For a real number a, if log15a+log32a(log15a)(log32a)=4\frac{\log_{15}{a}+\log_{32}{a}}{(\log_{15}{a})(\log_{32}{a})}=4(log15a)(log32a)log15a+log32a=4 then a must lie in the range
2<a<3
3<a<4
4<a<5
a>5
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