Calculate Probability of Losing 5, 10, 20 Times in a Row

[R.Clearwater]

Probability help...

If i have a standard 80% chance of wining and 20% chance of losing
than what is the chance of me losing 5 times in a row 10 times in a row
and 20 times in a row.

I would be very grateful if someone can show me how to calculate this on my own.

Thanks

I am trying to figure out the maximum number of divination in the losing direction
so occurrences 500.

 

[mathman]

Since your chance of losing is .2, the chances of losing k times in a row (assuming independence of the trials) is .2^k.

Your last sentence has typos - I can't understand it.