### Birthday

In a class of 23 students, the chances are fifty-fifty that two of them will have the same birthday. Now that may sound impossible since… Continue

### Hit Streak

In 1941, Joe DiMaggio got a hit in 56 straight games. This record has never been beaten. Some say it is the greatest record in… Continue

### Pascal’s Triangle

Another famous pattern, Pascal’s triangle, is easy to construct and explore on spreadsheets. Create a formula for any cell that adds the two cells in… Continue

### Probability: Flipping a Coin

That probability is multiplicative is not an easy concept for many of us. Using the spreadsheet with our ability to make tables and to cut… Continue