1) Count the number of different functions from the set {0, 1} into the set {1, 2, 9} 2) Count the number of different o

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1 Count The Number Of Different Functions From The Set 0 1 Into The Set 1 2 9 2 Count The Number Of Different O 1 (88.27 KiB) Viewed 62 times

I need help with (1), (2), (3)
1) Count the number of different functions from the set {0, 1} into the set {1, 2, 9} 2) Count the number of different one-to-one functions from the set {0, 1} into the set {1, 2, 9) 3) One elevator in a building starts with seven passengers and may stop at next nine floors (not including the floor it starts with). Assuming that it is equally likely that a passenger gets off at any of these nine floors, find the probability that at least two of these passengers will get off at the same floor.