Give positive numbers a, b and c are such that

ab + bc + ca + abc = 4,

What is the value of

1/a+2 + 1/b+2 + 1/c+2 = ?

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Give positive numbers a, b and c are such that

ab + bc + ca + abc = 4,

What is the value of

1/a+2 + 1/b+2 + 1/c+2 = ?

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