Math Grade 7: Worksheet on Union and IntersectionTeacher
Rugi
1.Write down the union and intersection of the following pairs
of sets:(i) A = {1, 2, 3, 4, 5, 6} B = {1, 3, 5, 7, 9}(ii) X = {a,
b, c, d, e} Y = {c, e, f, g}(iii) P = {x : x is a multiple of 2
between 9 and 21} Q = {x : x is a multiple of 3 between 10 and
20}(iv) M = {letters in the word COMPUTER} N = {letters in the word
CALCULATOR}2. If A = {a, b, c, d} B = {b, c, d, e} C = {c, d, e, f}
D = {d, e, f, g}, find(a) A - B
(b) B - C
(c) C - D
(d) D - A
Review: Subsets3. Fill in the blank spaces using the symbols or
.(a) {1, 2, 3} _____ {1, 3, 5}
(b) ____ {4, 7, 9}
(c) {x : x is rectangle in a plane} _____ {x : x is a
quadrilateral in a plane}
(d) {x : x is an odd natural number} {x : x is an integer}
(e) {x : x is a prime number} {x : x is a composite number}
(f) {5, 10, 15, 20, 25, 30}____{10, 20, 30, 40}4. Let A be the
set of letters of the word FOLLOW. Find(a) A
(b) n(A)
(c) Number of subsets of A(d) List all the subsets of A
Answers:1.(i) A B = {1, 2, 3, 4, 5, 6, 7, 9}; A B = {1, 3,
5}(ii) X Y = {a, b, c, d, e, f, g} X Y = {c, e}(iii) P Q = {10, 12,
14, 15, 16, 18, 20} P Q = {12, 18}(iv) M N = {c, o, m, p, u, t, e,
r, a, l} M N = {c, u, t, o, r}2.(a) {a}(b) {b}(c) {c}(d) {e, f,
g}3.(a) (b) (c) (d) (e) (f) 4.(a) {F, O, L, W}(b) 4(c) 16(d) {f},
{l}, {o}, {w}, {f,l}, {f,o}, {f,w},
{o,l},{o,w},{l,w},{f,o,l},{o,l,w},{f,l,w}, {f,o,w}, {f,o,l,w}, {
}
