Union of Sets

Q.

If A = {5, 6, 7, 8} and B = {7, 8, 9, 11}, then A ∪ B = _____.

1. {5, 6, 7, 8, 9, 10, 11}

2. {5, 6, 7, 8}

3. {9, 11}

4. {5, 6, 7, 8, 9, 11}

Q.

What is transpose means?

Q. If two sets A={1, 2, 4, 5, 6} and B={2, 3, 4, 8} then (A∩B)′ = A′ ∪ B′.

1. True
2. False

Q. in a town, 85% of the people speak tamil, 40% of the people speak english and 20% of the people speak hindi. also 32% speak english and tamil, 13% speak tamil and hindi and 10% speak english and hindi. find the percentage of people whocan speak all 3 languages

Q. The smallest set $X$ such that $X\cup$ {1, 2} = {1, 2, 3, 5, 9} is:

1. {1, 2, 3, 5, 9}
2. {2, 3, 5}
3. {3, 5, 9}
4. {3, 9}

Q.

Q. if A={1, 2, 3, 4, } and B={1, 2} then which one is true B⊂A OR B∈A ??

Q.

Let $F_1$ be the set of all parallelograms, $F_2$ the set of rectangles, $F_3$ the set of rhombuses, $F_4$ the set of squares and $F_5$ the set of trapeziums in a plane, then $F_1$ is equal to

1. $F_2\cup F_3\cup F_4\cup F_5$

2. $F_2\cup F_3\cup F_4\cup F_1$

3. $F_3\cap F_4$

4. $F_2\cap F_1$

Q.

If A is a subset of B, then A ⋃ B ___.

1. is a subset of A

2. equals A

3. equals B

4. equals phi

Q.

Question 164(iv)

If possible, find a hook-up of prime base number machine that will do the same work as the given stretching machine. Do not use
$(\times 1)$ machines.

Q. In a city, 20% of the population travels by car, 50% travels by bus, and 10% travels by both car and bus. What percentage of the population travels either by car or bus?

Q.

If A = {1, 2, 3, 4, 5},

B= {4, 5, 6, 7, 8} and C= {7, 8, 9, 10, 11}

Find :

(i) $A\cup B$ (ii) $A\cup C$

(iii) $B\cup C$

Q. (iii) A ∪ (B ∪ C) = (A ∪ B) ∪ (A ∩ C)

Q. In a city, 20% of the population travels by car, 50% travels by bus, and 10% travels by both car and bus. What percentage of the population travels either by car or bus?