Convert number `19` into binary system.

Explanation

To convert the decimal number 19 into binary, we will use the method of repeated division by 2 and keeping track of the remainders. Here’s a step-by-step solution:

### Step 1: Divide the number by 2
- Start with the number 19.
- Divide 19 by 2.
- **Calculation**: 19 ÷ 2 = 9 with a remainder of 1.

### Step 2: Record the remainder
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