Which class of levers has a mechanical advantage always greater than one? What change can be brought about in this lever to increase its mechanical advantage?

Explanation

### Step-by-Step Solution

1. **Identify the Class of Lever**:
The question asks which class of levers has a mechanical advantage always greater than one. The answer is the **second class lever**.

2. **Understanding Mechanical Advantage**:
Mechanical advantage (MA) is defined as the ratio of the effort arm to the load arm. For a second class lever, the formula for mechanical advantage is:
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