My wife yelled "Oww, my God he is splitting me" I moved forward again to stop it. She screamed "Leave us alone" I was like oh shit, ok. Oliver didn't care about any distress he was causing. He started to fuck her so fast it was like a blur. I moved to watch again. My wife started to moan. She was muttering "oh my God, Oh my God. Jesus this feels so good. shit shit shit" Then she let out a moan like I have never heard from her. I looked over in time to see her eyes roll up. Fuck me it was so hot to watch. Oliver oblivious to what was happing under him just kept going. I saw his knot start to form. I said to Sara "He is going to knot you. Its growing fast". About that time the knot starts to slap against her pussy lips. Oliver was trying so hard to ram it in there. The knot had grown to the size of a small orange when I watch as in one push it went half way in. My wife cried out in pleasure. Then in the blink of an eye, they were tied. Oliver continued to fuck her for a few more. “Well, we have n and we have r, so we just need to take n factorial and divide it by n times r factorial,” I explained, the solution clear to me.Taylor stared at me. I didn’t look her in the eye but I could feel it. I coughed nervously. “What’s n in this circumstance?” I asked her.Just staring. “What’s n in a permutation?” I asked, trying to broaden the definition. Still nothing. “The total. n is the set or population. So in this circumstance n is four, right?”Taylor nodded. I knew she didn’t get it. “And it’s asking about the top three in the race, so r, the subset or sample from the set is…” I waited for her. Nope. “...r is what number, Taylor?”Just silence. “I am spoonfeeding you the answer here,” I boldly complained.“Don’t be rude, I don’t get it! You’re the tutor, isn’t that your job?” she finally snapped at me.“There are two numbers I pointed out. One of them is n and one of them is r. I said that n is four, and the only other number is three and the only other variable is r. r.
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