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.
A tosses n+1 coins. B tosses n coins. B wins if he has at least as many heads as A. What is the probability that B wins?
5 pumpkins, given the sum of weights of every pair of two pumpkin, what's the weight of each pumpkin?
what day of the week will it be 10 years from today?
5 cent and 11 cent stamps. Max you can't buy with combination of these stamps.
Best of 7 game series between two teams, A and B. You get even odds on both teams for each game and you have to work out how much to bet on each game so that you win $100 if A wins the series and lose $100 if B wins the series and specifically how much you bet on the first game.
A survey is given to all passengers on a number of different planes. The survey asks each person how full their plane was. The people answer honestly. If 50% of people claim that their plane was 80% full, while the other 50% claim that their plane was 20% full, how full was the average plane?
The first three questions are mental math. I still remember the hardest one is calculating the 39% of 569 without any pen or paper. The next question is a simple probability: pick 2 cards from a set of poker without 2 Jokers, what is the probability that both cards are Ks. The last one is brain teaser: what is the angle between the minute hand and hour hand on a clock when 9:30.
How many digits in 2^30
Min number of people to guarantee at least 5 people share the same birthday month?
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