Difference between revisions of "Sums"

From mispar
Jump to: navigation, search
(Sum of Natural Numbers)
 
(4 intermediate revisions by the same user not shown)
Line 33: Line 33:
 
[[category: #sum of natural numbers]]
 
[[category: #sum of natural numbers]]
 
[[comment: 5-10]]
 
[[comment: 5-10]]
 +
}}</div></div><br>
 +
 +
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=6}^{11} i</math><div class="mw-collapsible-content">
 +
{{#annotask:
 +
[[category: #sum of natural numbers]]
 +
[[comment: 6-11]]
 
}}</div></div><br>
 
}}</div></div><br>
  
Line 237: Line 243:
 
[[category: #sum of odds]]
 
[[category: #sum of odds]]
 
[[comment: 1-19]]
 
[[comment: 1-19]]
}}</div></div><br>
 
 
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^9 7i</math><div class="mw-collapsible-content">
 
{{#annotask:
 
[[category: #sum]]
 
[[comment: 7i,1-9]]
 
 
}}</div></div><br>
 
}}</div></div><br>
  
Line 257: Line 257:
 
[[category: #sum of odds]]
 
[[category: #sum of odds]]
 
[[comment: aₙ, 1, 36]]
 
[[comment: aₙ, 1, 36]]
 +
}}</div></div><br>
 +
 +
== Sum of Sevens ==
 +
 +
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^9 7i</math><div class="mw-collapsible-content">
 +
{{#annotask:
 +
[[category: #sum]]
 +
[[comment: 7i,1-9]]
 
}}</div></div><br>
 
}}</div></div><br>
  
Line 406: Line 414:
 
[[category: #sum of cubes]]
 
[[category: #sum of cubes]]
 
[[comment: 1-5]]
 
[[comment: 1-5]]
 +
}}</div></div><br>
 +
 +
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{6} i^3</math><div class="mw-collapsible-content">
 +
{{#annotask:
 +
[[category: #sum of cubes]]
 +
[[comment: 1-6]]
 
}}</div></div><br>
 
}}</div></div><br>
  
Line 494: Line 508:
 
=== Cubes of Evens ===
 
=== Cubes of Evens ===
  
 +
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{3} \left(2i\right)^3</math><div class="mw-collapsible-content">
 +
{{#annotask:
 +
[[category: #cubes of evens]]
 +
[[comment: 2-6]]
 +
}}</div></div><br>
 
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{5} \left(2i\right)^3</math><div class="mw-collapsible-content">
 
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{5} \left(2i\right)^3</math><div class="mw-collapsible-content">
 
{{#annotask:
 
{{#annotask:
Line 530: Line 549:
 
[[category: #cubes of evens]]
 
[[category: #cubes of evens]]
 
[[comment: aₙ, 2, 1800]]
 
[[comment: aₙ, 2, 1800]]
 +
}}</div></div><br>
 +
 +
 +
<div class="mw-collapsible mw-collapsed"><math>\scriptstyle\sum_{i=1}^{5} \left(4i\right)^3</math><div class="mw-collapsible-content">
 +
{{#annotask:
 +
[[category: #sum of cubes]]
 +
[[comment: 4i,1-5]]
 
}}</div></div><br>
 
}}</div></div><br>

Latest revision as of 16:24, 1 July 2023

Sum of Natural Numbers

even number of terms = last term is even

[Expand]\scriptstyle\sum_{i=1}^6 i

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

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

[Expand]\scriptstyle\sum_{i=4}^{10} i

[Expand]\scriptstyle\sum_{i=5}^{10} i

[Expand]\scriptstyle\sum_{i=6}^{11} i

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

[Expand]\scriptstyle\sum_{i=1}^{14} i

[Expand]\scriptstyle\sum_{i=1}^{16} i

[Expand]\scriptstyle\sum_{i=1}^{18} i

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

[Expand]\scriptstyle\sum_{i=1}^{100} i

odd number of terms = last term is odd

[Expand]\scriptstyle\sum_{i=1}^{7} i

[Expand]\scriptstyle\sum_{i=1}^{9} i

[Expand]\scriptstyle\sum_{i=1}^{11} i

[Expand]\scriptstyle\sum_{i=1}^{13} i

[Expand]\scriptstyle\sum_{i=1}^{17} i

[Expand]\scriptstyle\sum_{i=1}^{19} i

[Expand]\scriptstyle\sum_{i=1}^{25} i

Find the last term

[Expand]\scriptstyle\sum_{i=1}^{n} i=55

[Expand]\scriptstyle\sum_{i=5}^{n} i=45

[Expand]\scriptstyle\sum_{i=1}^{n} i=120

[Expand]\scriptstyle\sum_{i=1}^{n} i=210

[Expand]\scriptstyle\sum_{i=1}^{n} i=465

Find the first term

[Expand]\scriptstyle\sum_{i=m}^{10} i=45

Sum of Evens

[Expand]\scriptstyle\sum_{i=1}^{4} 2i

[Expand]\scriptstyle\sum_{i=1}^{5} 2i

[Expand]\scriptstyle\sum_{i=1}^{6} 2i

[Expand]\scriptstyle\sum_{i=3}^{6} 2i

[Expand]\scriptstyle\sum_{i=1}^{10} 2i

Find the last term

[Expand]\scriptstyle\sum_{i=1}^{n} 2i=42

[Expand]\scriptstyle\sum_{i=1}^{n} 2i=30

Sum of Odds

[Expand]\scriptstyle\sum_{i=1}^{5} \left(2i-1\right)

[Expand]\scriptstyle\sum_{i=1}^{6} \left(2i-1\right)

[Expand]\scriptstyle\sum_{i=1}^{7} \left(2i-1\right)

[Expand]\scriptstyle\sum_{i=4}^{7} \left(2i-1\right)

[Expand]\scriptstyle\sum_{i=1}^{15} \left(2i-1\right)

[Expand]\scriptstyle\sum_{i=1}^{10} \left(2i-1\right)

Find the last term

[Expand]\scriptstyle\sum_{i=1}^{n} \left(2i-1\right)=25

[Expand]\scriptstyle\sum_{i=1}^{n} \left(2i-1\right)=36

Sum of Sevens

[Expand]\scriptstyle\sum_{i=1}^9 7i

Sum of Triples

[Expand]\scriptstyle\sum_{i=1}^{7} 3i

Sum of Powers of Two = Sum of Even-Times-Even Numbers

[Expand]\scriptstyle\sum_{i=1}^{6} 2^{i-1}

[Expand]\scriptstyle\sum_{i=1}^{7} 2^{i-1}

[Expand]\scriptstyle\sum_{i=1}^{8} 2^{i-1}

[Expand]\scriptstyle\sum_{i=1}^{12} 2^{i-1}

[Expand]\scriptstyle\sum_{i=3}^{6} 2^{i-1}

Sum of Powers of Three

[Expand]\scriptstyle\sum_{i=1}^{4} 3^{i-1}

Sum of Powers of Four

[Expand]\scriptstyle\sum_{i=1}^{3} 4^{i-1}

Sum of Squares

[Expand]\scriptstyle\sum_{i=1}^{4} i^2

[Expand]\scriptstyle\sum_{i=1}^{5} i^2

[Expand]\scriptstyle\sum_{i=1}^{7} i^2

[Expand]\scriptstyle\sum_{i=4}^{8} i^2

[Expand]\scriptstyle\sum_{i=1}^{10} i^2

[Expand]\scriptstyle\sum_{i=1}^{12} i^2

[Expand]\scriptstyle\sum_{i=5}^{12} i^2

Squares of Evens

[Expand]\scriptstyle\sum_{i=1}^{4} \left(2i\right)^2

[Expand]\scriptstyle\sum_{i=1}^{5} \left(2i\right)^2

[Expand]\scriptstyle\sum_{i=3}^{8} \left(2i\right)^2

Squares of Odds

[Expand]\scriptstyle\sum_{i=1}^{4} \left(2i-1\right)^2

[Expand]\scriptstyle\sum_{i=1}^{5} \left(2i-1\right)^2


[Expand]\scriptstyle\sum_{i=1}^{4} \left(4i\right)^2

Sum of Cubes

[Expand]\scriptstyle\sum_{i=1}^{5} i^3

[Expand]\scriptstyle\sum_{i=1}^{6} i^3

[Expand]\scriptstyle\sum_{i=1}^{7} i^3

[Expand]\scriptstyle\sum_{i=1}^{10} i^3

[Expand]\scriptstyle\sum_{i=4}^{10} i^3

[Expand]\scriptstyle\sum_{i=5}^{10} i^3

[Expand]\scriptstyle\sum_{i=5}^{12} i^3

Find the last term

[Expand]\scriptstyle\sum_{i=1}^{n} i^3=225

[Expand]\scriptstyle\sum_{i=1}^{n} i^3=3025

Cubes of Odds

[Expand]\scriptstyle\sum_{i=1}^{5} \left(2i-1\right)^3

[Expand]\scriptstyle\sum_{i=1}^{7} \left(2i-1\right)^3

[Expand]\scriptstyle\sum_{i=3}^{5} \left(2i-1\right)^3

[Expand]\scriptstyle\sum_{i=4}^{6} \left(2i-1\right)^3

Find the last term

[Expand]\scriptstyle\sum_{i=1}^{n} \left(2i-1\right)^3=256

[Expand]\scriptstyle\sum_{i=1}^{n} \left(2i-1\right)^3=1225

Cubes of Evens

[Expand]\scriptstyle\sum_{i=1}^{3} \left(2i\right)^3

[Expand]\scriptstyle\sum_{i=1}^{5} \left(2i\right)^3

[Expand]\scriptstyle\sum_{i=1}^{6} \left(2i\right)^3

[Expand]\scriptstyle\sum_{i=2}^{6} \left(2i\right)^3

[Expand]\scriptstyle\sum_{i=4}^{8} \left(2i\right)^3

Find the last term

[Expand]\scriptstyle\sum_{i=1}^{n} \left(2i\right)^3=400

[Expand]\scriptstyle\sum_{i=1}^{n} \left(2i\right)^3=1800


[Expand]\scriptstyle\sum_{i=1}^{5} \left(4i\right)^3