In a certain flower garden, each flower was either red, yellow, or blue. All three colors were in the garden. One person visited and said that whatever 3 flowers you picked, one was going to be yellow. Another person visited and said that whatever 3 flowers you picked, one was going to be red. Is it true that for every 3 flowers you pick, one will be blue as well? Why?
Fibonacci numbers
We write all possible sequences of black and white dots, such that no two black next to each other. How many different sequences are there?
2 of length 1 of them;
3 of length 2;
5 of length 3...
Writing them one under another - if longer sequence extends the shorter one - helps.
The students extended this picture and found that there were 8 sequences of length 3.
Battleship
The kids formed two teams of two and used coordinates to find each others' hidden battleships.
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