found this question on a website , it gives the answer as 0.27
but it doesn't show how the author arrived at the answer
ive never dealed with replacement before
A bag contains 5 yellow beads and 5 blue beads (all identical apart from the colour).
7 beads are drawn randomly from the bag, each being replaced before the next is drawn.
Calculate the probability that
Exactly 4 of the beads drawn are yellow
7! / 4! 3! = 35 * multiplied by 0.5 seven times= 0.2734
I dont know if the formula used is correct
or i simply got lucky and matched authors answer ?