Use the form below to do your conversion.
Solution
Step1
Log2117981=Log(17981) ÷ Log(21)
Log(17981)= 4.2548138410349
Log(21)=1.3222192947339
Log2117981=4.2548138410349 ÷ 1.3222192947339
Ans=3.2179335591159
Step2
Alternatively, the logarithm can be calculated like this.