question

the probabilities of solving a specific problem independently by a and b are   respectively. if both try to solve the problem independently,find the probability that the problem is solved.

 

 

 

 

 

 

 

 

let a: a solves the problem and b:b solves the problem independently.
given that

 p(the problem is solved)(the problem is not solved)
 
 
alternatively, we p(the problem is solved)