```
public class Solution
extends Object
```
470 - Implement Rand10() Using Rand7()\. Medium Given the **API** `rand7()` that generates a uniform random integer in the range `[1, 7]`, write a function `rand10()` that generates a uniform random integer in the range `[1, 10]`. You can only call the API `rand7()`, and you shouldn't call any other API. Please **do not** use a language's built-in random API. Each test case will have one **internal** argument `n`, the number of times that your implemented function `rand10()` will be called while testing. Note that this is **not an argument** passed to `rand10()`. **Example 1:** **Input:** n = 1 **Output:** [2] **Example 2:** **Input:** n = 2 **Output:** [2,8] **Example 3:** **Input:** n = 3 **Output:** [3,8,10] **Constraints:** * 1 <= n <= 10⁵ **Follow up:** * What is the [expected value](https://en.wikipedia.org/wiki/Expected_value) for the number of calls to `rand7()` function? * Could you minimize the number of calls to `rand7()`?

Class Solution