Question: i have trouble with this question in my c++ class. Please help me with it :(( thank you guys !!! 6. (a) How many 4-sequences

i have trouble with this question in my c++ class. Please help me with it :(( thank you guys !!!

6. (a) 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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