Probability doesn’t add, it multiplies. Think about it, you could take 20 7% chances and still fail, so it can’t simply add up, but the chance of all fails gets smaller into near nothingness as more tries are included. To get the probability of ten 7%s, take the odds of it not happening (0.93), multiply it by itself ten times (0.93^10). That equals 0.48, the odds of failing all after seven tries. Take the inverse (1-0.48=0.52) and you have a 52 percent chance of success from 10 7% s.
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