Made etude 1.3 consistent between display constant and answer #3
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6.674e-11 would've probably been exact enough and might have led to a slighty nicer looking answer than 2.6696320000000002e-8 in the displayed output. I just wanted to offer some update that made the displayed answer match code done with the value for gravitational constant provided in the text so other newcomers wouldn't be confused with a "Hey, I'm not getting that" moment…
BTW, sorry I closed the first pull request. I'm not too accustomed to doing these. We still use svn in my shop.