log7/6+ log8/7+ log9/8+ log10/9+ log12/10
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log (ab) = log a + log b
log7/6+ log8/7+ log9/8+ log10/9+ log12/10
= log (7/6 * 8/7 * 9/8 * 10/9 * 12/10)
= log 12/6
=log 2
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