Which formula can be used to find the probability of one

Last updated: 7/27/2022

Which formula can be used to find the probability of one forward step in a random walk, beginning at location O, given two total steps and the probability of a forward step is 0.5? a) P(1) = 2!/1!(1)! ×0.5¹(0.5)¹ b) P(1) = 2!/2! ×0.5¹(0.5)¹ c) P(1) = 2!/0! ×0.5¹(0.5)¹ d) P(1) = 5!/2!(3)! × 0.5²(0.5)³