Question: How many 4-sequences on {0..9} are there? (b) How many 4-sequences on {0..9} do not begin with 0? (c) How many 4-sequences on {0..9} begin
How many 4-sequences on {0..9} are there?
(b) How many 4-sequences on {0..9} do not begin with 0?
(c) How many 4-sequences on {0..9} begin and end with 0?
(d) How many 4-sequences on {0..9} do not begin and end with 0?
(e) How many 4-sequences on {0..9} do not begin or end with 0?
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