Let \(\vec a, \vec b, \vec c\) be vector such that \(|\vec a| = 2, – McqOptions

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1.	Let \(\vec a, \vec b, \vec c\) be vector such that \(\|\vec a\| = 2, \|\vec b\|= 3, \|\vec c\| = 5\) and \(\vec a + \vec b + \vec c = 0\). The value of \(\rm \vec a.\vec b + \vec b.\vec c + \vec c.\vec a\) is?
A.	38
B.	-38
C.	19
D.	-19
Answer» E.

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