Apattern of letter arrangements begins with the 3 steps below. first continue the pattern for 3 more steps:

1. a
2.aba
3.abcba
4.
5.
6.

how many letters are in each step above?

how many letters do you think there will be in step 10?

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.