The answer is
And that is correct
Choose the number that is composite. A. 2 B. 21 C. 31 D. 17
1 answer:
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Not A: We can't have because
is undefined for a logarithm of any base.
B is true: for any base.
Not C: If , then
, but
which only reduces to
if
. This can only happen if
, however, but we've assumed otherwise.
Not D: The reasoning for C not being correct is enough to rule out this possibility.