This is my questio wht is a Stereogenic centre ??

Give me the answer with some illustrations....

I wanna have the answer right now so badly plsss...

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reply as soon as u can guys

Dont worry always gonna be approved !!!!!

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

Using above information

Match the following 

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Plz answer this query.....................................................................................................

how to represent the possible fischer projections for 2-bromohexane