A multinomial experiment is a statistical experiment and it consists of n repeated trials. Each trial has a discrete number of possible outcomes. On any given trial, the probability that a particular outcome will occur is constant.
Pr=n!(n1!)(n2!)...(nx!)P1n1P2n2...Pxnx
Where −
n = number of events
n1 = number of outcomes, event 1
n2 = number of outcomes, event 2
nx = number of outcomes, event x
P1 = probability that event 1 happens
P2 = probability that event 2 happens
Px = probability that event x happens
Problem Statement:
Three card players play a series of matches. The probability that player A will win any game is 20%, the probability that player B will win is 30%, and the probability player C will win is 50%. If they play 6 games, what is the probability that player A will win 1 game, player B will win 2 games, and player C will win 3?
Solution:
Given:
n = 12 (6 games total)
n1 = 1 (Player A wins)
n2 = 2 (Player B wins)
n3 = 3 (Player C wins)
P1 = 0.20 (probability that Player A wins)
P1 = 0.30 (probability that Player B wins)
P1 = 0.50 (probability that Player C wins)
Putting the values into the formula, we get:
Pr=n!(n1!)(n2!)...(nx!)P1n1P2n2...Pxnx, Pr(A=1,B=2,C=3)=6!1!2!3!(0.21)(0.32)(0.53), =0.135