In a box there are 15 geophones, inclusive of 5 highly sensitive. Three geophones undertake occasionally. To find the probability that even if one of taken three geophones will appear highly...

In a box there are 15 geophones, inclusive of 5 highly sensitive. Three geophones undertake occasionally. To find the probability that even if one of taken three geophones will appear highly sensitive.

The probability of occurrence of a signal reflected from horizon A, is equal P₁, and from horizon B is equal P₂. To find probability of occurrence even if one of these signals, if reflected signals are independent.

To find probability P(A₁  A¯
₂) by using known probabilities: