prove that c0+c1+c2+........+cn=2n

from the binomial expansion :
(1+x)n=C0n+C1n.x+C2n.x2+...........+Cnn.xn ...........(1)now substituting x =1 on the both sides , we have:(1+1)n=C0n+C1n.1+C2n.12+........+Cnn.1nC0n+C1n+C2n+....+Cnn=2n

hope this helps you

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