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#themathpage[http://www.themathpage.com/aprecalc/permutations-combinations.html Permutation and combination]
 
#themathpage[http://www.themathpage.com/aprecalc/permutations-combinations.html Permutation and combination]
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'''Useful video from khan academy and youtube'''  
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'''Useful video from khan academy and youtube'''<br>
 
{{#widget:YouTube|id=oQpKtm5TtxU}}
 
{{#widget:YouTube|id=oQpKtm5TtxU}}
 
{{#widget:YouTube|id=XqQTXW7XfYA}}
 
{{#widget:YouTube|id=XqQTXW7XfYA}}
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