AD is based on the supposed death/crucifixion of Jesus. What event is the Norse dating system based on?1 AnswerHistory1 decade ago
In the expansion of e is it possible/probable/guaranteed that pi will appear?
Or, is there some reason why it wouldn't?4 AnswersMathematics1 decade ago
given the factorization of B = 2 x 3^5 x 5 x 3503099 x 31323293 and B= M x N, and M and N are mirror numbers..
meaning that M is N backwards, like 12345 and 54321, what are M and N and what unique and interesting property do M and N share?1 AnswerMathematics1 decade ago
If an ordered set of n unique items is randomized, what is the probability of at least one item will end up in the same place it was before randomization?
I know the answer is close to 60% that at least one will, but I don't know how to derive the answer or an expression for the probability.5 AnswersMathematics1 decade ago
What is the probability of any item matching with two sets of items with different, random ordering?
A match would be any one of the same item in each set ending up in the same position. For instance, if two decks of shuffled cards are laid out in pairs, one card from each deck, what are the chances that at least one pair will be of identical cards?
I am more interested in how to solve the general problem than a specific answer. Simple combinatorics doesn't seem to do it. It seems to be devilishly recursive.3 AnswersMathematics1 decade ago