The video starts with a greeting and farewell, followed by a repeated countdown sequence of '3, 2, 1, go.'

What is the main purpose of the introduction in the video?

• To explain the countdown process

• To greet the viewers

• To summarize the video content

• To provide technical instructions

How many times is the countdown '3, 2, 1, go' repeated in the first set?

• Once

• Twice

• Three times

• Four times

What is the duration of each countdown in the first set?

• 30 seconds

• 40 seconds

• 20 seconds

• 10 seconds

What distinguishes the final countdown from the previous ones?

• It includes additional instructions

• It is repeated twice

• It is shorter

• It is longer

What is the total duration of the video?

• 70 seconds

• 100 seconds

• 90 seconds

• 50 seconds