# Some properties of natural numbers :

**1•Sum of first n natural numbers : 1 + 2 + 3 +……+ n = n ( n +1)/2**

**2• Sum of squares of first n natural numbers : 1² + 2² + 3² +……+ n² = n ( n +1) ( 2n +1) /6**

**3• Sum of cubes of first n natural numbers : 1³ + 2³ + 3³ +……+ n³ = [ n ( n +1)/2]²**

**4• Sum of first n odd numbers: n²**

**5• Sum of first n even numbers: n² + n**

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