Union Questions

1. The union of two sets A and B is a set consisting of all the elements of set A and set B.

a) True
b) False

2. A={1,4,5}, B={3,9,11}

a) AÈB={1,5,9,11}
b) AÈB={1,5,9,11}
c) AÈB={1,4,5,9,11}
d) AÈB={1,3,4,5,9,11}

3. A={-1,3,4}, B={2,3,9}, AÈB=?

a) {-1,2,3,4,9}
b) {-1,0,2,3,4,9}
c) {-1,1,2,3,4,9}
d) {-1,2,3,4}

4. A={ }, b={-1,8,3,4,6}, AÈB=?

a) {-1,8,3,4}
b) {1,8,3,4,6}
c) {8,3,4,6}
d) {-1,8,3,4,6}

5. A={1,2,4,6,8}, b={ }, AÈB=?

a) {1,2,4,6,8,9}
b) {1,2,4,6,8}
c) {1,2,4,6}
d) {2,4,6,8}

6. A={4,5,7,11}, B={-1,2}, AÈB=?

a) {-1,2,4,7,10,11}
b) {-1,2,4,5,7,10}
c) {-1,2,4,5,7,10,11}
d) {-1,2,4,5,7,11}

7. A={ }, B={ }, AÈB=?

a) { } { }
b) { } { } { }
c) 2 { }
d) { }

8. A={1.2, 1.4, 1.6, 1.9}, B={1.7, 1.5, 1.6}, AÈB=?

a) 1.6,
b) {1.2, 1.4, 1.5, 1.6, 1.6,1.7, 1.9}
c) {1.2, 1.4, 1.5, 1.6, 1.7, 1.9}
d) {1.2, 1.4, 1.5, 1.7, 1.9}

9. A={1.2, 1.8, 1.14}, B={4,3}, AÈB=?

a) {1.2, 1.8, 3, 1.3,1.14, 4}
b) {1.2, 1.8, 3, 1.14, 4}
c) {1.2, 1.8, 3, 1.14}
d) {2, 1.8, 3, 1.14, 4}

10. A={0.1, 0.2, 0.3}, B={1.1, 1.3}, AÈB=?

a) {0.1, 0.2, 0.3, 1.1}
b) {0.1, 0.2, 0.3, 1.1, 1.3,1.1}
c) {0.1, 0.2, 0.3, 1.1, 1.3}
d) {0.1, 0.2, 0.3, 1.1, 1.3,1.1, 1.3}

11. A={1/2, 1/4, 1/6}, B={1/3, 1/5, 1/4}, AÈB=?

a) {1/2, 1/3, 1/4, 1/5, 1/6}
b) {1/2, 1/3, 1/7, 1/5, 1/6}
c) {1/2, 1/3, 1/3, 1/5, 1/6}
d) {1/2, 1/3, 1/4, 1/4,1/5, 1/6}

12. A={3/5, 8/5, 9/5}, B={1, 3, 9}, AÈB=?

a) {1, 3/5, 3, 8/5, 9/5}
b) {1, 3/5, 3, 8/5, 9}
c) {1, 3/5, 3, 8/5, 9, 9/5,9}
d) {1, 3/5, 3, 8/5, 9, 9/5}

13. A={0.8, 0.6, 0.9}, B={1/2, 1/4}, AÈB=?

a) {0.8, 0.6, 0.9, 0.5, 0.25}
b) {8, 0.6, 0.9, 0.5, 0.25}
c) {0.2, 0.6, 0.9, 0.5, 0.25}
d) {0.4, 0.6, 0.9, 0.5, 0.25}

14. A={1/2, 1/3, 1/4}, B={-1, -3, -7}, AÈB=?

a) {1/2, 1/3, 1/4, -1, 3, -7}
b) {1/2, 1/3, 1/4, -1, -3, -7}
c) {1/2, 1/3, 1/4, 1, -3, -7}
d) {1/2, 1/3, 1/4, -1, -3, 7}

15. A={-1, 1/2, -2, 1/4}, B={1/2, -4, 1/6, -7}, AÈB=?

a) {-1, 1/2, -2, -1/4,1/2, -4, 1/6, -7}
b) {-1, 1/2, -2, 1/4,1/2, -4, 1/6, -7}
c) {-1, 1/2, -2, 1/4,-1/2, -4, 1/6, -7}
d) {-1, 1/2, -2, 1/4,1/2, 4, 1/6, -7}

16. A={ }, B={1/2, 1/5, 1/7, 1/9}, AÈB=?

a) {1/2, 1/5, 1/6, 1/9}
b) {1/2, 1/5, 1/7, 1/9}
c) {1/2, 1/5, 1/9, 1/9}
d) {1/2, 1/5, 1/5, 1/9}

17. A={-3, 5/2, -6, 7/3}, B={-4, 0}, AÈB=?

a) {-3, 5/2, 6,-4, 0, 7/3}
b) {-3, 5/2, -6,4, 0, 7/3}
c) {-3, 5/2, -6,-4, 0, -7/3}
d) {-3, 5/2, -6,-4, 0, 7/3}

18. B={ }, C={-1, 2/3, 4, -6}, BÈC=?

a) {0-1, 2/3, 4, -6}
b) {-0-1, 2/3, 4, -6}
c) {-1, 2/3, 4, -6}
d) {-01, 2/3, 4, 6}

19. B={1/2, 1/4, -1/9}, C={3,4}, BÈC=?

a) {1/2, 3, 1/4, 4,1/2, -1/9}
b) {1/2, 3, 1/4, -4, -1/9}
c) {-1/2, 3, 1/4, 4, -1/9}
d) {1/2, 3, 1/4, 4, -1/9}

20. U={-1, -3, -9}, Y={-1, 6}, UÈY=?

a) {-1, -3, 6,-9 }
b) {-1, -3, -9, 1, 6}
c) {-1, -3, -9, -1, 6}
d) {-1, -3, -9, -1, -6}

21. Z={a, b, c, d}, Y={a, b, x, z}, ZÈB=?

a) {a, b, b, c, d, x, z}
b) {a, b, c, d, z}
c) {a, b, c, d, x, z}
d) {a, b, c, d, x}

22. A={a, p, s}, B={s, x, t, m}, AÈB=?

a) {a, p, s, s,x, t, m}
b) {a, p, s, x, t, m}
c) {a, p, s, x, t}
d) {a, p, 2s, x, t, m}

23. D={-2, a, 3, q, 4}, F={f, 9},DÈF=?

a) {-2, a, 3, q, 4, f, 9}
b) {2, a, 3, q, 4, f, 9}
c) {-2, a, 3, q, 4, f}
d) {-2, 3, q, 4, f, 9}

24. U={a, c, k, -1, m}, Y={ }, UÈY=?

a) {a, k, -1, m}
b) {a, c, k, -1, m}
c) {a, c, k, -1}
d) {a, c, k, 1, m}

25. L={a, 1/2}, M={b,1/4, d}, LÈM=?

a) {a, 1/2, -b,1/4, d}
b) {a, 1/2, b,1/4, d}
c) {a, 1/2, b,-1/4, d}
d) {a, -1/2, b,1/4, d}

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