brainteaser: 30 people are 15 couples. they shake hands, but two people of the same couple don't shake hands with each other. now you know 29 people shake hands with different numbers of people (e.g. one person shakes hands with 4 others, another person shakes hands with 5 people, etc). question: how many people did the 30th person shake hands with?
I flip a coin three times, and tell you I got heads on one of the flips. What's the probability I got 2 heads and one tails (not necessarily in that order).
How do you check if your regression parameters are significant? Given a number's prime number decomposition, how many ways are there of factorizing it into two different factors?
I have 12 poker chips, we (two people) take it in turns to pick up one or two chips, you win if you don't pick up the last chip. What is the optimal strategy? Do you want to go first or second? What about if there were 150 chips?
What's the weight of each of five melons if their pairwise weights sum to 16,17,18,19,20,21,22,24,25, and 26?
Two teams A and B played football twice. Two independent matches. The average shoot of A in match 1 is greater than B. The average shoot of A in match 2 is also greater than B. So can we say the average shoot of A is greater than B in two matches together? If so, why? If not, give me an example. -------- Failed to give the example, but I believe that the statement is not right.
Given a biased coin that flips heads 70% of the time, how can I use it to give a 50-50% random outcome?
Expected number of rolls to see each side of a die at least once?
100 Coins with 5 Pirates Puzzle was asked with Senior Pirates' vote counts variant to reach 50% votes
Why are you interested in trading?
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