Find $ \int_{ - 1}^1 {n\choose k}(1 + x)^{n - k}(1 - x)^k\ dx\ (k = 0,\ 1,\ 2,\ \cdots n)$.
1. Define the integral \( I_k \) as follows:
   \[
   I_k = \int_{-1}^1 \binom{n}{k} (1 + x)^{n - k} (1 - x)^k \, dx
   \]
   where \( k = 0, 1, 2, \ldots, n \).

2. Notice that the binomial coefficient \(\binom{n}{k}\) is a constant and can be factored out of the integral:
   \[
   I_k = \binom{n}{k} \int_{-1}^1 (1 + x)^{n - k} (1 - x)^k \, dx
   \]

3. To solve the integral, we use the substitution \( x = \cos \theta \), where \( dx = -\sin \theta \, d\theta \). The limits of integration change from \( x = -1 \) to \( x = 1 \) to \( \theta = \pi \) to \( \theta = 0 \):
   \[
   I_k = \binom{n}{k} \int_{\pi}^{0} (1 + \cos \theta)^{n - k} (1 - \cos \theta)^k (-\sin \theta) \, d\theta
   \]
   Reversing the limits of integration:
   \[
   I_k = \binom{n}{k} \int_{0}^{\pi} (1 + \cos \theta)^{n - k} (1 - \cos \theta)^k \sin \theta \, d\theta
   \]

4. Use the identity \( 1 + \cos \theta = 2 \cos^2 \left( \frac{\theta}{2} \right) \) and \( 1 - \cos \theta = 2 \sin^2 \left( \frac{\theta}{2} \right) \):
   \[
   I_k = \binom{n}{k} \int_{0}^{\pi} \left( 2 \cos^2 \left( \frac{\theta}{2} \right) \right)^{n - k} \left( 2 \sin^2 \left( \frac{\theta}{2} \right) \right)^k \sin \theta \, d\theta
   \]

5. Simplify the integrand:
   \[
   I_k = \binom{n}{k} 2^n \int_{0}^{\pi} \cos^{2(n - k)} \left( \frac{\theta}{2} \right) \sin^{2k} \left( \frac{\theta}{2} \right) \sin \theta \, d\theta
   \]

6. Use the substitution \( u = \frac{\theta}{2} \), \( du = \frac{1}{2} d\theta \), and change the limits of integration from \( \theta = 0 \) to \( \theta = \pi \) to \( u = 0 \) to \( u = \frac{\pi}{2} \):
   \[
   I_k = \binom{n}{k} 2^n \int_{0}^{\frac{\pi}{2}} \cos^{2(n - k)} u \sin^{2k} u \cdot 2 \sin u \cos u \, du
   \]
   \[
   I_k = \binom{n}{k} 2^{n+1} \int_{0}^{\frac{\pi}{2}} \cos^{2(n - k) + 1} u \sin^{2k + 1} u \, du
   \]

7. Recognize that the integral is a standard form of the Beta function \( B(x, y) \):
   \[
   \int_{0}^{\frac{\pi}{2}} \cos^{2a - 1} u \sin^{2b - 1} u \, du = \frac{1}{2} B(a, b)
   \]
   where \( a = n - k + \frac{1}{2} \) and \( b = k + \frac{1}{2} \).

8. Using the Beta function identity \( B(x, y) = \frac{\Gamma(x) \Gamma(y)}{\Gamma(x + y)} \) and the property of the Gamma function \( \Gamma(n + 1) = n! \):
   \[
   I_k = \binom{n}{k} 2^{n+1} \cdot \frac{1}{2} \cdot \frac{\Gamma(n - k + \frac{1}{2}) \Gamma(k + \frac{1}{2})}{\Gamma(n + 1)}
   \]
   \[
   I_k = \binom{n}{k} 2^n \cdot \frac{\Gamma(n - k + \frac{1}{2}) \Gamma(k + \frac{1}{2})}{\Gamma(n + 1)}
   \]

9. Simplify using the fact that \( \Gamma(\frac{1}{2}) = \sqrt{\pi} \) and \( \Gamma(n + \frac{1}{2}) = \frac{(2n)!}{4^n n!} \sqrt{\pi} \):
   \[
   I_k = \binom{n}{k} 2^n \cdot \frac{\frac{(2(n - k))!}{4^{n - k} (n - k)!} \sqrt{\pi} \cdot \frac{(2k)!}{4^k k!} \sqrt{\pi}}{n!}
   \]
   \[
   I_k = \binom{n}{k} 2^n \cdot \frac{(2(n - k))! (2k)! \pi}{4^n (n - k)! k! n!}
   \]

10. Recognize that the integral is independent of \( k \) and thus \( I_k = I_0 \):
    \[
    I_0 = \int_{-1}^1 (1 + x)^n \, dx
    \]

11. Use the binomial theorem to expand \( (1 + x)^n \):
    \[
    I_0 = \int_{-1}^1 \sum_{j=0}^n \binom{n}{j} x^j \, dx
    \]

12. Integrate term by term:
    \[
    I_0 = \sum_{j=0}^n \binom{n}{j} \int_{-1}^1 x^j \, dx
    \]

13. Note that the integral of \( x^j \) over \([-1, 1]\) is zero for odd \( j \) and \(\frac{2}{j+1}\) for even \( j \):
    \[
    I_0 = \sum_{j \text{ even}} \binom{n}{j} \frac{2}{j+1}
    \]

14. Recognize that the sum of the binomial coefficients for even \( j \) is half the sum of all binomial coefficients:
    \[
    I_0 = \frac{2^{n+1}}{n+1}
    \]

15. Therefore, \( I_k = I_0 = \frac{2^{n+1}}{n+1} \).

The final answer is \(\boxed{\frac{2^{n+1}}{n+1}}\)