If a + b + c = 10 and ab + bc + ca = 31, then the value of a2 + b2 + c – McqOptions

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1.	If a + b + c = 10 and ab + bc + ca = 31, then the value of a2 + b2 + c2 is
A.	48
B.	38
C.	18
D.	20
Answer» C. 18

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