Losing Sequence Formula

Number of bets=1/(1-strike rate)n
n= number of losing sequences.
Strike rate is expressed as decimal.
/ means ¡§divide by¡¨
How many bets am I likely to have before I experience a losing sequence of 5. Strike rate is 25% (ie 0.25)
Bets=1/(1-0.25)5
=1/(0.75)5
= 1/(0.75x0.75x0.75x0.75x0.75)
=1/0.237
=4.2
ie 4 bets

There is also a formula for the longest losing sequence, but can¡¦t find it at the moment.