which of the following sets are closed under addition. if a set is not closed under addition explain why not. Please help ASAP! :(?

b. T = {3n| n ε W}

c. N={1,2,3,4,5,...}

d. V={3,5,7}

2 Answers

  • rotchm
    Lv 7
    3 weeks ago

    Here, the first step is to know what "closed under addition" means. 

    So take your notes or documentation, and write here (as an update in your post) what "closed under addition" means. Then we will take it from there. 

  • Jim
    Lv 7
    3 weeks ago

    c. yes

    d no, 3+5 = 8 and that's not part of set

    no idea what b. says....

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