–
A specific symbol four times on a payline16-reel slot machines
2. Case B – different numbers of stops and symbol distributions on the reels
2.1
Event –
A specific symbol four times on a payline
The probability of
is
,
where 
are
the basic probabilities of that symbol occurring on the reels respectively.
2.3 Event
–
A specific symbol exactly three times on a payline
The probability of
is
,where
are
the basic probabilities of that symbol occurring on the reels respectively.
2.5 Event
–
Any combination of two specific symbols on a payline
The probability of
is
,
where 
are
the basic probabilities of the two symbols occurring on the reels respectively.