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If your pupose is for objective or multiple choice questions-
log 10=1; log 5+log 2=1; 0.5log 25+log 2=1; 0.5(log 2.5 + log 10)+ log 2=1;
Say log 2.5is nearly equal to log 2
Then, 1.5 log 2=0.5; *log 2=0.3
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