MPM2D Test and some fun questions 2016-09-26


We had our Linear Systems test this morning. In my period 2 class there was quite a bit of extra time for some people (we had a 15 minute presentation in the period 1 class), so I put the following three questions on the board. If you solve them all and email me a solution (answers along with how you got them!) then I’ll have a delicious treat for you in a few days.

  1. How many numbers between 1000 and 9999 have no repeating consecutive digits? (e.g. 7225 is not allowed, but 7252 is)
  2. How many numbers between 1000 and 9999 have no zeros?
  3. How many numbers between 1000 and 9999 have exactly one zero?

These are optional, if that wasn’t already clear :)

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