2 log 5 + log a − log b
2 log 5 − log a − log b
2 log 5 + log a + log b
2 log 5 − log a + log b
Prove that
(i)log 12=log 3+log 4
(ii) log 50=log 2+2 log 5
(iii) log(1+2+3)=log 1+log 2+log 3