# Posted in October 2012 …

## #math trivia solution: What are the chances that a given pair of students are born in the same month?

#math trivia: What are the chances that a given pair of students are born in the same month? Assume all 12 months equally likely — Burt Kaliski Jr. (@modulomathy) October 8, 2012 Assuming all 12 months are equally likely, the chances that a given pair of students are born in the same month is 1/12. … Continue reading

## Keeping the Sky(lab) from Falling

It was a crowd-sourced crisis response of sorts, the anticipated but mostly uncontrollable descent of Skylab from its perch more than 200 miles above the sky back to earth in 1979.  News reports alerted of the impending surrender of the United States’ first space station to the forces of gravity and atmospheric friction, and watchers … Continue reading

## #math trivia solution: The principal chooses one student from each of 5 classes …

#math trivia: The principal chooses one student from each of 5 classes of 20 for a project team. How many different “rosters” are possible? — Burt Kaliski Jr. (@modulomathy) October 1, 2012 The number of possible rosters is 3.2 million. This assumes that it doesn’t matter in what order the students are chosen for the … Continue reading