Mathematics, 12.11.2020 22:30, crystalpearl188

Mrs Durbin knows how to use texting, instant messenger, emailing, calling, and mailing letters to communicate with her students. She must select 2 methods of communication out of the 5 to send her students an important
message. In how many ways can she choose the communication methods?

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Mrs Durbin knows how to use texting, instant messenger, emailing, calling, and mailing letters to co...