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Instructional Video3:17
HOLIDAY RIDDLE - In The "12 Days Of Christmas," How Many Total Gifts Are Given? Instructional Video
Curated Video

HOLIDAY RIDDLE - In The "12 Days Of Christmas," How Many Total Gifts Are Given?

6th - 11th
You may remember the song "12 Days of Christmas" in which each day you get N gifts, plus all the gifts from the preceding days. How many gifts are given in total? What's a general formula? Algebraic
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Instructional Video6:57
When Is Christmas? Mentally Convert Date To Day Of The Week Instructional Video
Curated Video

When Is Christmas? Mentally Convert Date To Day Of The Week

6th - 11th
January 1, 2016 is a Friday. When will Christmas be in 2016? What about Christmas in 2055? You can do this in your head! Blog post (text explanation) Doomsday Rule...
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Instructional Video7:45
The Monty Hall Problem - Christmas Lectures with Ian Stewart Instructional Video
The Royal Institution

The Monty Hall Problem - Christmas Lectures with Ian Stewart

9th - 11th
Ian Stewart explains the Monty Hall problem and its solution. Subscribe for regular science videosf='http://bit.ly/RiSubscRibe' target='_blank' rel='nofollow'>videos The Monty Hall problem became infamous in the 1990s where newspaper...
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Instructional Video5:08
Calculate The Day Of The Week For Any Date Until 2099 Instructional Video
Curated Video

Calculate The Day Of The Week For Any Date Until 2099

6th - 11th
January 1, 2015 is a Thursday. When will Christmas be in 2015? You can do this in your head! Doomsday Ruleref='http://en.wikipedia.org/wiki/Doooccursrule' target='_blank' rel='nofollow'>Rule CalDoomsday the day New Years (1/1)
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