Question

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Answer 1

a) $D_{10}= \{1,2,5,10\}$
    $M_{5}= \{0,5,10,15,20......\}$

    D10 ∩ M5={5,10}

b) $D_{12}= \{1,2,3,4,6,12\}$
    $M_{6}= \{0,6,12,18,24......\}$

    D12 ∩ M6={6,12}

c) $D_{20}= \{1,2,4,5,10,20\}$
    $D_{15}= \{1,3,5,15\}$

    D20 U D15={1,2,3,4,5,10,15,20}

d) $D_{40}= \{1,2,4,5,8,10,20,40\}$
    $M_{5}= \{0,5,10,15,20,25,30,35,40......\}$

    D40 ∩ M5={5,10,20,40}