Difference between revisions of "Sums"

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(Sum of Evens)
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=== even number of terms = last term is even ===
 
=== even number of terms = last term is even ===
  
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^8 i</math><div class="mw-collapsible-content">
 
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[[comment: 1-8]]
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{10} i</math><div class="mw-collapsible-content">
 
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[[comment: 1-10]]
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{12} i</math><div class="mw-collapsible-content">
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{20} i</math><div class="mw-collapsible-content">
 
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[[comment: 1-20]]
 
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}}
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{100} i</math><div class="mw-collapsible-content">
 
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[[comment: 1-100]]
 
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=== odd number of terms = last term is odd ===
 
=== odd number of terms = last term is odd ===
  
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{7} i</math><div class="mw-collapsible-content">
 
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[[comment: 1-7]]
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{9} i</math><div class="mw-collapsible-content">
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{17} i</math><div class="mw-collapsible-content">
 
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[[comment: 1-17]]
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{19} i</math><div class="mw-collapsible-content">
 
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}}</div></div><br>
  
 
== Sum of Evens ==
 
== Sum of Evens ==
  
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{4} 2i</math><div class="mw-collapsible-content">
 
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[[comment: 2-8]]
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{6} 2i</math><div class="mw-collapsible-content">
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{10} 2i</math><div class="mw-collapsible-content">
 
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[[category: #sum of evens]]
 
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[[comment: 2-20]]
 
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}}</div></div><br>
  
 
== Sum of Odds ==
 
== Sum of Odds ==
  
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{5} \left(2i-1\right)</math><div class="mw-collapsible-content">
 
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[[comment: 1-9]]
 
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{6} \left(2i-1\right)</math><div class="mw-collapsible-content">
 
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[[category: #sum of odds]]
 
[[comment: 1-11]]
 
[[comment: 1-11]]
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{7} \left(2i-1\right)</math><div class="mw-collapsible-content">
 
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[[comment: 1-13]]
 
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}}</div></div><br>
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== Sum of Powers of Two = Sum of Even-Times-Even Numbers ==
 
== Sum of Powers of Two = Sum of Even-Times-Even Numbers ==
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{6} 2^{i-1}</math><div class="mw-collapsible-content">
 
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[[comment: 1-32]]
 
[[comment: 1-32]]
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{7} 2^{i-1}</math><div class="mw-collapsible-content">
 
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[[comment: 1-64]]
 
[[comment: 1-64]]
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}}</div></div><br>
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{8} 2^{i-1}</math><div class="mw-collapsible-content">
 
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[[comment: 1-128]]
 
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<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=3}^{6} 2^{i-1}</math><div class="mw-collapsible-content">
 
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}}</div></div><br>
  
 
== Sum of Powers of Three ==
 
== Sum of Powers of Three ==

Revision as of 10:25, 7 January 2020

Sum of Natural Numbers

even number of terms = last term is even

[Expand]\scriptstyle\sum_{i=1}^8 i

[Expand]\scriptstyle\sum_{i=1}^{10} i

[Expand]\scriptstyle\sum_{i=1}^{12} i

[Expand]\scriptstyle\sum_{i=1}^{20} i