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 May19 asked Flip a coin 6 times. What is probability of at least 4 heads? Jul13 asked Will a point moving on a sphere always at an angle x (0 deg. < x < 90 deg.) to the “equator” reach a “pole”? Dec24 asked 2 slightly different situations in which 2 coins are tossed. Does the knowledge of an observer effect the probabilities of the outcomes? Dec21 asked In a family with two children, what are the chances, if one of the children is a girl, that both children are girls? Dec16 asked Sum of 1/n*n for n = 1 ,2 ,3, …? Nov30 asked Is Knopp's “Theory and Application of Infinite Series” out of date? Nov29 asked What is limit of $\sum \limits_{n=0}^{\infty}\frac{1}{(2n)!}$? Nov20 asked Let $(n, m)$, $n < m$ be an Amicable Pair. Looking for large sets of integers that cannot be $n$. Nov15 asked True?: Let $(n, m)$ be an arbitrary Amicable Pair. Then $n$ is odd iff its last digit is $5$ Nov13 asked Amicable Pair $(a, b)$: given $a$, what are limits on size of $b$? Nov9 asked Amicable pairs: any use for them yet?