Find the odd one out of the following...

Find the odd one out of the following

A

`(1)/(2)` ab sin C

B

`(1)/(2)` bc sin A

C

`sqrt(s(s - a)(s - b)(s - c))`

D

`sqrt(((s - b) (s - c))/(bc))`

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The correct Answer is:

B, C

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