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3 (three)
The number 3 has some interesting properties.
Prime number
The number 3 has only two divisors, and is thus a prime number.
Triangles
Triangles can be used to explain many mathematical properties. One of the best known is Pascal's triangle.
Trinity
In some religions the number three plays an important role. There the only one true God consitsts of three persons 1. the Father, 2. the Son and 3. the Holy Spirit.