If a + b + c = 9 and ab + bc + ca = 18, then what is the value of $a^{3}+b^{3}+c^{3}-3abc$ ?

If a + b + c = 9 and ab + bc + ca = 18, then what is the value of $a^{3}+b^{3}+c^{3}-3abc$ ?
1). 189
2). 243
3). 361
4). 486

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