Into how many regions do $n$ great circles, no three of which meet at a point, divide a sphere?
1. **Define the function \( f(n) \)**:
   Let \( f(n) \) be the number of regions on the surface of a sphere formed by \( n \) great circles, where no three circles meet at a single point.

2. **Base cases**:
   - For \( n = 1 \), a single great circle divides the sphere into 2 regions. Thus, \( f(1) = 2 \).
   - For \( n = 2 \), two great circles intersect at two points, dividing the sphere into 4 regions. Thus, \( f(2) = 4 \).

3. **Inductive step**:
   Suppose \( n \) circles have been drawn, and we add an \((n+1)\)-th circle. The new circle intersects each of the existing \( n \) circles at 2 points, creating \( 2n \) points of intersection. These \( 2n \) points divide the new circle into \( 2n \) arcs.

4. **Effect of adding a new circle**:
   Each of these \( 2n \) arcs divides one of the existing regions into two parts. Therefore, the addition of the \((n+1)\)-th circle creates \( 2n \) new regions.

5. **Recurrence relation**:
   The total number of regions formed by \( n+1 \) circles is the number of regions formed by \( n \) circles plus the \( 2n \) new regions:
   \[
   f(n+1) = f(n) + 2n
   \]

6. **Solve the recurrence relation**:
   To find a closed form for \( f(n) \), we use the recurrence relation:
   \[
   f(n+1) = f(n) + 2n
   \]
   We start with the base case \( f(1) = 2 \).

   - For \( n = 1 \):
     \[
     f(2) = f(1) + 2 \cdot 1 = 2 + 2 = 4
     \]
   - For \( n = 2 \):
     \[
     f(3) = f(2) + 2 \cdot 2 = 4 + 4 = 8
     \]
   - For \( n = 3 \):
     \[
     f(4) = f(3) + 2 \cdot 3 = 8 + 6 = 14
     \]

   We observe that the recurrence relation can be solved by induction. Assume \( f(k) = k^2 - k + 2 \) holds for some \( k \geq 1 \). Then for \( k+1 \):
   \[
   f(k+1) = f(k) + 2k
   \]
   By the inductive hypothesis:
   \[
   f(k+1) = (k^2 - k + 2) + 2k = k^2 + k + 2 = (k+1)^2 - (k+1) + 2
   \]
   Thus, the formula \( f(n) = n^2 - n + 2 \) holds for all \( n \geq 1 \).

7. **Initial condition**:
   For \( n = 0 \), there are no circles, so the entire sphere is one region:
   \[
   f(0) = 1
   \]

The final answer is \( \boxed{ f(n) = n^2 - n + 2 } \) for \( n \geq 1 \) and \( f(0) = 1 \).