Solution of problem N3179 Bernoulli probability theory

Solution of problem N3179 Bernoulli probability theory

3179. How many times do you need to throw a dice so that with a probability of no less than a) 0.5, b) 0.9, at least once a “six” (six points) fell out?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)