A.  { M, a, b}

        B.   \[\{ M, \phi, a\}\]

        C.  \[\{ M,a, b, \phi\}\]

        D.  {x}

        A.  {1, 3, 4, 5, 6}

        B.  {1, 3, 6, 9}

        C.  {1,3, 7 8,10}

        D.  {2, 4, 6, 8, 10}

        A.  4

        B.  7

        C.  3

        D.  5

        A.  \[\pm 2\]

        B.  \[\pm 1\]

        C.  \[ 2~~or~~ 3\]

        D.  \[ -2 ~~or~~ -3\]

        A.  \[\pm 1\]

        B.  \[\pm 6\]

        C.   \[ 1 ~~or~~ 6\]

        D.  \[ -1~~or~~ -6\]

        A.  20

        B.  12

        C.  25

        D.  30

        A.  12

        B.  25

        C.  20

        D.  30

        A.  15

        B.  7

        C.  8

        D.  10

        A.   \[\frac{3}{4}\]

        B.  \[\frac{3n}{4}\]

        C.  \[\frac{n}{4}\]

        D.   \[\frac{1}{4}\]

        A.  \[2n^{2}+n\]

        B.  \[\frac{n(n-1)}{2}\]

        C.  \[n^{2}-n\]

        D.  \[2n^{2}+2n\]

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