If a2 + b2 + c2 = 21, and a + b + c = 7, then (ab + bc + ca) is equal – McqOptions

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1.	If a2 + b2 + c2 = 21, and a + b + c = 7, then (ab + bc + ca) is equal to∶
A.	14
B.	8
C.	12
D.	28
Answer» B. 8

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