A real estate man has eight master keys to open several new homes. Only one master key will open any given house. If `40%` of these homes are usually left unlocked, what is the probability that the real estate man can get into a specific home if he selects three master keys at random before leaving the office ?

A real estate man has eight master keys to open several new homes. Only in master key will open any given house. If 40% of these homes are usually left unlocked, what is the probability that the real estate man can get into a specific home if he selects three master keys at random before leaving the office?

A real estate man has eight master keys to open several new homes. Only in master key will open any given hour. If 40% of these homes are usually left unlocked, what is the probability that the real estate man can get into a specific home if he selects three master keys at random before leaving the office?

Column I, Column II If the probability of getting at least one head is at least 0.8 in n trials, then value of n can be, p. 2 One mapping is selected at random from all mappings of the set s={1,2,3, ... ,n} into itself. If the probability that the mapping being one-one is 3/32, then the value of n is, q. 3 If m is selected at random from set {1,2,..., 10} and the probability that the quadratic equation 2x^2+2m x+m+1=0 has real roots is k , then value of 5k is more than, r. 4 A man firing at a distant target as 20% chance of hitting the target in one shoot. If P be the probabililty of hitting the target in "n" attempts , where 20 P^2-13 P+2lt=0, then the ratio of maximum and minimum value of n is less than, s. 5