g

cho n thuộc N*
CÓ  $2+C^1_n+C^2_n+....+C^{n-1}_n=4^{2014}$

$(1+1)^n=C^0_n+C^1_n+C^2_n+...+C^n_n=2+C^1_n+C^2_n+...+C^{n-1}_n=4^{2014}$
=> $2^n=4^{2014}$
=> $2^n=2^{2015}$
=> $n=2015$

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