Discrete Structure (DS) MCQ Questions with answers and solutions Page 1

Q. Let A={a, b, {c, d}, e}. How many elements does A contain?

(A) 1
(B) 2
(C) 3
(D) 4

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✅ Correct Answer: (D) 4

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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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✅ Correct Answer: (C) {4, 5} is an element of A.

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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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✅ Correct Answer: (C) {1, 2, 3,...,999,1000}

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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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✅ Correct Answer: (B) B = {x | x + 10 = 10}

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

Q. . Let S={1, 2, 3}. How many subsets does S contain?

(A) 3
(B) 6
(C) 8
(D) 4

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✅ Correct Answer: (C) 8

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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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✅ Correct Answer: (B) {1, 2, 3}

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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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✅ Correct Answer: (A) A U B ={v, w, x, y, z}

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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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✅ Correct Answer: (D) all are equal

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

Q. A U A=A according to …….law

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

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✅ Correct Answer: (C) Indempotent law

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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

💬 Discuss

✅ Correct Answer: (C) universal

Published by Mr. Dubey ⭐ 104.82K Points at 14-Jun-2020 11:59 am in Discrete Structure (DS)

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