Question: In a rural area 12 mailboxes are located at a general store. a) If a news carrier has 20 identical fliers, in how many ways

In a rural area 12 mailboxes are located at a general store.
a) If a news carrier has 20 identical fliers, in how many ways can she distribute the fliers so that each mailbox gets at least one flier?
b) If the mailboxes are in two rows of six each, what is the probability that a from part (a) will have 10 fliers distributed to the top six boxes and 10 to the bottom six?

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