Given $n \in\mathbb{N}$, ﬁnd all continuous functions $f : \mathbb{R}\to \mathbb{R}$ such that for all $x\in\mathbb{R},$
\[\sum_{k=0}^{n}\binom{n}{k}f(x^{2^{k}})=0. \]
1. We start with the given functional equation:
   \[
   \sum_{k=0}^{n}\binom{n}{k}f(x^{2^{k}})=0
   \]
   for all \( x \in \mathbb{R} \).

2. We can rewrite the sum by splitting the last term:
   \[
   \sum_{k=0}^{n}\binom{n}{k}f(x^{2^{k}}) = \sum_{k=0}^{n-1}\binom{n-1}{k}f(x^{2^{k}}) + \sum_{k=0}^{n-1}\binom{n-1}{k}f(x^{2^{k+1}})
   \]
   This uses the binomial coefficient identity:
   \[
   \binom{n}{k} = \binom{n-1}{k} + \binom{n-1}{k-1}
   \]

3. Define a new function \( g(x) \) as follows:
   \[
   g(x) = \sum_{k=0}^{n-1}\binom{n-1}{k}f(x^{2^{k}})
   \]
   Then the equation becomes:
   \[
   g(x) + g(x^2) = 0
   \]
   This implies:
   \[
   g(x^2) = -g(x)
   \]

4. We can iterate this relationship:
   \[
   g(x^4) = g((x^2)^2) = -g(x^2) = g(x)
   \]
   Similarly:
   \[
   g(x^{2^m}) = (-1)^m g(x)
   \]

5. For \( x \geq 0 \), consider the limit as \( m \to \infty \):
   \[
   g(x^{2^m}) \to g(0)
   \]
   Since \( g(x^{2^m}) = (-1)^m g(x) \) and \( g \) is continuous, we have:
   \[
   g(0) = 0
   \]
   Therefore, \( g(x) = 0 \) for all \( x \geq 0 \).

6. For \( x < 0 \), we use the fact that \( g(x^2) = -g(x) \). Since \( g(x) = 0 \) for \( x \geq 0 \), we have:
   \[
   g(x) = -g(x^2) = -0 = 0
   \]
   Thus, \( g(x) = 0 \) for all \( x \in \mathbb{R} \).

7. Since \( g(x) = 0 \), we have:
   \[
   \sum_{k=0}^{n-1}\binom{n-1}{k}f(x^{2^{k}}) = 0
   \]
   This implies that any solution for rank \( n \) is also a solution for rank \( n-1 \).

8. The only solution at rank 0 is \( f(x) = 0 \).

9. By induction, the only solution for any \( n \) is:
   \[
   f(x) = 0
   \]

The final answer is \( \boxed{ f(x) = 0 } \).