if a b c 12 a2 b2 c2 52 then what is ab bc ca equal to | Examsbook

2408

Q:
If a + b + c = 12, a² + b² + c² = 52, then what is ab + bc + ca equal to-

1
124
2
120
3
46
4
75

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Answer : 3. "46"

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