Context: If all three parameters are used, they are specified in the following form: [frame size][scanning system][frame or field rate] or [frame size]/[frame or field rate][scanning system].[citation needed] Often, frame size or frame rate can be dropped if its value is implied from context. In this case, the remaining numeric parameter is specified first, followed by the scanning system.

Question: What are the three HDTV parameters?
Answer: [frame size][scanning system][frame or field rate]

Question: Which two parameters can be dropped if its value is implied from context?
Answer: frame size or frame rate

Question: When can the frame size or frame rate parameter specification be dropped?
Answer: if its value is implied from context

Question: When a parameter is dropped, the remaining numeric parameter is specified first, followed by what?
Answer: the scanning system

Question: What are the three SDTV parameters?
Answer: Unanswerable

Question: Which two parameters can't be dropped if its value is implied from context?
Answer: Unanswerable

Question: When can the frame size or frame rate parameter specification be not dropped?
Answer: Unanswerable

Question: When a parameter is dropped, the remaining numeric parameter is specified last, followed by what?
Answer: Unanswerable