A group of 50 students were required to clear 2 tasks, one in rock-climbing and the other in bridge
crossing during an adventure sports expedition. 30 students cleared both the tasks. 37 cleared bridge
crossing, 38 students cleared rockclimbing.
How many students could not clear any task?

• No of students those completed atleast one task = 37+38-30 = 45
  
  No of students those did not complete any task = 50-45=5
  
• 12 years agoHelpfull: Yes(25) No(0)
• here use the formula P(AUB)=P(A)+P(B)-P(A intersection B)
  =37+38-30=45
  but total is 50 therefor required student=50-45=5
  
• 12 years agoHelpfull: Yes(10) No(1)
• 37 cleared bridge and 38 cleared crossing.out of it 30 cleared both.so total students who participated in atleast one events are 30+8+7=45
  
  so students who doesn't cleared any one of the pgm =50-45=5
• 12 years agoHelpfull: Yes(3) No(2)
• cleared both = 30
  cleared bridge crossing = 7
  cleared rockclimbing = 8
  None = 50 - (30+7+8)
  = 5
  Ans = 5
• 12 years agoHelpfull: Yes(2) No(0)
• here 37+38=75 then 75-30=45 so we get people who did atleast one task.den total ie 50-45=5
  we get students who cud not clear any task.
• 7 years agoHelpfull: Yes(0) No(0)