Sharing the choclate

The three friends  

Thete are three friends A,B,C who were very helpful aand so got a choclate as a reward.They decided to share the choclate in a unique way. A gave half of the choclate to B and then B gave half of the choclate with himto C and then C gave half of the choclate to A.How much part of the cholate does A have after n such cycles.

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