a, b, c are three positive numbers, such that, a + b + c = 20, a2 + b2 – McqOptions

MCQOPTIONS

1.	a, b, c are three positive numbers, such that, a + b + c = 20, a2 + b2 + c2 = 152.The value of (ab + bc + ca) is equal to:
A.	110
B.	112
C.	102
D.	124
Answer» E.

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