Question

Three red and three blue flags are arranged randomly along

a wire. What is the probability that the six flags alternate in
color?
A. 1/20
B. 1/10
C. 1/4
D. 1/2​

Answer 1

The answer would be B

Answer 2

`|\Omega|=(6!)/(3!3!)=(4\cdot5\cdot6)/(2\cdot3)=20\\A=\{RBRBRB,BRBRBR\}\\|A|=2\\\\P(A)=(2)/(20)=(1)/(10)`