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35 bytes removed ,  20:13, 5 August 2015
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=video on progressions from youtube=
 
=video on progressions from youtube=
 
#[http://www.onlinemathlearning.com/arithmetic-series.html Arithmetic progressions videos]
 
#[http://www.onlinemathlearning.com/arithmetic-series.html Arithmetic progressions videos]
{{#widget:YouTube|id=cZktajOmonQ}}
   
{{#widget:YouTube|id=TFWGV_84uEk}}
 
{{#widget:YouTube|id=TFWGV_84uEk}}
 
{{#widget:YouTube|id=1SDLmYdZkho}}
 
{{#widget:YouTube|id=1SDLmYdZkho}}
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