Solution of problem N1352 probability theory total prob

Solution of problem N1352 probability theory total prob

1352. There are 10 revolvers in the box, among them 6 shot. The probability to hit the target with one shot from the targeted gun is 0.9, of the unopened - 0.7. Find the likelihood that as a result of a shot from the randomly taken revolver will hit.

Additional information:

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