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If a^2+b^2+c^2=1 then ab+bc+ca lies in t...

If `a^2+b^2+c^2=1` then `ab+bc+ca` lies in the interval

A

`[-1//2,1]`

B

`[-1,1//2]`

C

`[-1//2,2]`

D

`[-1,2]`

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The correct Answer is:
A
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