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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