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If a, b, and c are distinct positive rea...

If `a, b,` and `c` are distinct positive real numbers and `a^2 + b^2 + c^2=1,` then `ab + bc + ca` is

A

less than `1`

B

equal to `1`

C

greater than `1`

D

any real no.

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The correct Answer is:
(a)
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