Sup of T if T={n∈ℕ: 1/2^n ≤1} where T is a subset of real numbers

Question

T={n∈ℕ: 1/2^n ≤1} I worked this question and for the supremum i got 1/2 because 0<1/2^n ≤1/2....Is the question even correct in the first place? May you have your analysi