In a recent experiment conducted by the Department of Energy, light bulbs were tested to measure how long they lasted. Each company submitted $20$ light bulbs, which were turned on and left on until they burned out. Here were the results:
- All $20$ "Super Bright" light bulbs burned out after exactly $1{,}500$ hours.
- The first "Delightful Bright" light bulb burned out after $1{,}200$ hours, and one additional bulb burned out every $50$ hours until they were all burned out.
- One of the "Pretty Bright" light bulbs burned out after just $16$ hours. The other $19$ bulbs lasted between $1{,}900$ and $2{,}000$ hours.
**Which of the following is true? **
[[☃ radio 1]]