Show that
1 − 1 2n n ≥ 1 2 .
Hint: For n ≥ 2,
1 − 1 2n n ≥ 1 1+1/(2n − 1)n ≥ 1 e1/(2n−1) n ≥ 1 e2/3 ≥ 1 2 .
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