0
The sum of the first x odd numbers is equal to x2 (for integers only.)
For example, take 72: We'll take the first seven odd numbers:
1 + 3 + 5 + 7 + 9 + 11 + 13
= 4 + 12 + 20 + 13
= 16 + 33
= 49
This then, can be expressed as follows:
x
x2 = Σ(2n - 1)
n=1
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∙ 11y ago
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