Discrete Structure (DS) MCQs with answers Page - 1

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Q. Let A={2,{4,5},4} Which statement is correct?

  • (A) 5 is an element of A.
  • (B) {5} is an element of A.
  • (C) {4, 5} is an element of A.
  • (D) {5} is a subset of A.

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Q. Which of these sets is finite?

  • (A) {x | x is even}
  • (B) ) {1, 2, 3,...}
  • (C) {1, 2, 3,...,999,1000}
  • (D) none

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Q. Which of these sets is not a null set?

  • (A) A = {x | 6x = 24 and 3x = 1}
  • (B) B = {x | x + 10 = 10}
  • (C) C = {x | x is a man older than 200 years}
  • (D) D = {x | x < x}

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Q. . Which set S does the power set 2S = {Ф,{1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3}} come from?

  • (A) {{1},{2},{3}}
  • (B) {1, 2, 3}
  • (C) {{1, 2}, {2, 3}, {1, 3}}
  • (D) {{1, 2, 3}}

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Q. Let A = {x, y, z}, B = {v, w, x}. Which of the following statements is correct?

  • (A) A U B ={v, w, x, y, z}
  • (B) A U B = {v, w, y, z}
  • (C) A U B = {v, w, x, y}
  • (D) A U B ={x, w, x, y, z}

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Q. which sets are equal ? 1.{r,s,t} 2.{s,s,t,r} 3.{t,r,t,s}

  • (A) 1 and 2
  • (B) 2 and 3
  • (C) 1 and 3
  • (D) all are equal

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Q. A U A=A according to …….law

  • (A) Associative law
  • (B) commutative law
  • (C) Indempotent law
  • (D) distributive law

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Q. In any application of the theory of sets, the members of all the sets belongs to …… set

  • (A) union
  • (B) intersection
  • (C) universal
  • (D) cardinal

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