Cool
Eureka!
I've got it!

moving to a new location. all things must pass.

I have many methods to calculate these type of streak problems, some including very accurate approximations and one using Excel (or a spreadsheet) that even a 10 year old can do! Yeah!! They be here next year.
New home is not yet ready.

last update: July 24, 2015

Here are links NOT to visit as these calculators have errors in them still.
http://www.sportsbookreview.com/betting-tools/streak-calculator/
http://completecurrencytrader.com/Tools/streak-probability-calculator.php
http://www.beatingbonuses.com/calc_streak.htm
http://www.casinoreview.org/resources/caculator/streak-calculator/

they are close, maybe, how close do you wants?

there are 2 I found that works.
The 1st rounds to 2 places for accuracy streak calculator

WolframAlhpa does this also, Some large calculations will time out. WolframAlhpa
one can add p=0.55 to the end as an example where p is not = 0.50

try run 2 in 4 flips at 50% success
p=50%
then try run 5 in 20 flips. success = 0.2498703
then try run of 5 in 100 flips, success = 0.810109599