(b) log 200 base 5 - log 64 base 25
= log25 base 5.
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log 200 base 5- log 25 base 5 = log 64 base 25
log (200/25) base 5 = log 64 base 25
log 8 base 5 = log 64 base 25
log 8 base 5 = log 8^2 base 5^2
log 8 base 5 = log 8 base 5
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