Solution of problem N3411 probability theory

Solution of problem N3411 probability theory

3411. In preparation for the colloquium, the student learned 20 questions out of 30. What is the probability that he will answer only 1 question out of 3 questions on the ticket?

Additional information:

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

Discount for regular customers! If the total of your purchases from the seller Massimo86 exceeds:

• $30 discount 10%
• $20 discount 7%
• $18 discount 6%
• $15 discount 5%
• $12 discount 4%
• $9 discount 3%
• $6 discount 2%
• $3 discount 1%