An elevator starts with 5 person on board and goes up 5 floors...
What is the probability that all 5 passengers are on a different floor?
a>24/109
b>55/412
c>10/512
d>none of these

• ans is 5!/5^5
• 10 years agoHelpfull: Yes(26) No(3)
• there is one ruls (n!)/(n^f)
  n=number of person
  f=number of floor
  thus(5!)/(5^5)=24/625 is answer
• 10 years agoHelpfull: Yes(20) No(0)
• total number of choices=5*5*5*5*5=5^5
  favourable cases=5*4*3*2*1=5!
  probability=5!/5^5
• 10 years agoHelpfull: Yes(19) No(0)
• So consider lift has 5 persons... when it reaches 1st floor...1 person may go out and other person may enter it... so there are people from different floor...hence the possible solution may be 5*4*3*2*1/5^5=120/5^5=24/125 so d. none of these
• 10 years agoHelpfull: Yes(6) No(5)
• n(s)=5^5
  n(e)=5*4*3*2*1
  p(e)= 5!/(5^5).
• 10 years agoHelpfull: Yes(2) No(1)
• 5*4*3*2*1/5^5
• 10 years agoHelpfull: Yes(1) No(0)
• ans is 5!/5^5
• 10 years agoHelpfull: Yes(1) No(0)
• 24/625 is the answer !!!
• 10 years agoHelpfull: Yes(1) No(0)
• its dummy question........
• 9 years agoHelpfull: Yes(0) No(0)