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• 24 If the empty set is a subset of every set, why write ... $\cup \{∅\}$?
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• 9 What is the probability of a four occurring in 300 dice rolls?
• 9 Is every coset of a group closed under taking inverses?
• 6 How to find the radius of convergence of $\sum^{\infty}_{n=1}\frac{n!}{n^n}z^n$?
• 6 Find a two digit number $15$ more than $4$ times its reverse.
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