SpeedJack 21 vs Counting and Probability Usage & Stats
It is an application which helps your blackjack skill. You can practice basic strategy of blackjack with this application. If you succeed 20 times consecutive correct answer, your time record spent will be ranked on the server. Please sign-in before challenge. If you can pass this challenge easily without failing in short time, your winning average at the casino will be increasing.
- Apple App Store
- Free
- Education
Store Rank
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The subject of counting and probability is a challenging in math competitions for math learners. This APP collects the math competition problems on various levels in a organized way and provide solutions to all the problems. The problems can be bookmarked for reviews and notes can be written for the study.
- Apple App Store
- Free
- Education
Store Rank
- -
SpeedJack 21 VS. 
Counting and ProbabilityJanuary 11, 2026