In a box were put ten balls , 4 white , 3 blue , 2 red and 1 black . withdrawing only 4 , as there are combinations

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62

If np3 /nc2 = 6, find the value of n