If $a^{2}+b^{2}+c^{2}$ = 14 and a + b + c = 6, then the value of (ab + bc + ca) is,

If $a^{2}+b^{2}+c^{2}$ = 14 and a + b + c = 6, then the value of (ab + bc + ca) is,
1). 11
2). 12
3). 13
4). 14

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