Q. If A speaks the truth 20% of the times, B speaks the truth 40% of the times. What is the probability that they tell the truth at the same time.

• P(A)= 20/100=1/5
  P(B) = 40/100= 2/5
  P(A and B)
  =1/5* 2/5
  =2/25 ans.
• 11 years agoHelpfull: Yes(41) No(1)
• 8/100
  as 20/100*40/100.
• 11 years agoHelpfull: Yes(4) No(4)
• p(a and b )= p(a)*p(b) iff a and b are independent events.. therefore here p(a and b)= p(a)*p(b)=(1/5*2/5)=2/25.
• 10 years agoHelpfull: Yes(3) No(0)
• A speaks truth A(T)=20/100=1/5 and A(not speaking truth)=4/5
  similarly B(T)=2/5 and B(not speaking truth)=3/5
  probability that they tell the truth at the same time= 1-(4/5*3/5)=13/25
  
  
  
• 10 years agoHelpfull: Yes(2) No(2)
• A speaks truth A(T)=20/100=1/5 and A(not speaking truth)=4/5
  similarly B(T)=2/5 and B(not speaking truth)=3/5
  probability that they tell the truth at the same time=(1/5*3/5)+(2/5*4/5)=11/25
  
• 10 years agoHelpfull: Yes(1) No(0)
• So is it 3/5 ?
• 11 years agoHelpfull: Yes(0) No(7)
• 2/25 is the probability
• 10 years agoHelpfull: Yes(0) No(0)