An alphabet of 20 symbols is used for transmitting messages in a communications system

) An al pha bet of 2o symtolsi used for transmiting 3ymbolS use or tronsmi messages in a communica tions system. a) hou many disteict messages (lst of symbols) of LO symbols can the ronsmter generate if s ymbals con be re Peated 7 b ayis ane of the sym bals. thw meny distinct messages of Ja symbo ls have exoct 4in the message? with no repeoted symbols ? win at lea st ane rcpeated sym bol? c) How many distinct messa ges of ymbols )How mony distinct messages ym bo ls