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If a,b,c are the sides of a triangle the...

If a,b,c are the sides of a triangle then the range of `(ab+bc+ca)/(a^(2)+b^(2)+c^(2))` is

A

`[1, 2)`

B

`[1//2, 1]`

C

`[1//2, 2)`

D

`(-1//2, 2)`

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The correct Answer is:
2
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