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Spaced repetition: each system comes back just before you would forget it. Fast, correct answers stretch the interval; a miss brings it back the same day.
Free practice: Frozen ball system (long–short–long)Score 0/0
Frozen ball system (long–short–long)
Aim = Arrival ÷ 2 (aim 0 = position of the frozen ball)
Your ball:White(cue ball · 1)
Other balls:YellowRed
Expected shot:Frozen ball system (long–short–long)MixedCushion orderLong → Short → Long
Given:
Arrival20
In this position, what is Aim?
Task: put the given values into the system's formula and calculate Aim. Enter the answer as the number read on the table's Aim scale.