[20] If log 2 = 0.30103, the number of digits in 2^{64} is:

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If log 2 = 0.30103, the number of digits in $2^{64} $is:

Explanation:

$\log_(2^{64})$=$64 \times log 2$
=$(64 \times 0.30103)$
=19.26592
Its characteristic is 19.
Hence then number of digits in $2^{64}$ is 20.

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