If \log_10 3 = 0.477, the no. of digits in 3^40 is:

Logarithms Practice Test 1

Question : 25 of 40

Marks: +1, -0

\log_10 3 = 0.477

, the no. of digits in

3^40

is:

Solution:

Let

x=3^40

∴\log x=40\log_10 3

=40×0.477=19.08

Hence the number of digits in x is 20.

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