If A = {a, b, c} and B = {p, q}, then find :

(i) A x B (ii) B x A (iii) A x A (iv) B x B (v) n (A x B) (vi) n (B x A) (vii) n (A x A) (viil) n (B x B).


(i) A  X B = {a, b, c} x (p, q} = {{a, p}, {a, q}, (b, p}, {b, q}, {c, p}, {c, q}}

(ii) B x A = {p, q} x {a, b, c} = {{p, a, }.{p, b}.{p, c}.{q, a}.{q, b}.{q, c}}

(iii} A x A = {a, b, c} x {a, b, c} = {(a, a), (a, b), (a, c), (b,l, a), (b,, b), (b, c), (c a), (c, b), (c, c)}

(iv) B x B = {p.q} x {p.q} = {(p.p), (p.q), (p.q), (p.q)

(v) n(A x B) = n(A) x n(B) = 3 x 2 = 6

(vi) n(B xA) = n(B) x n(A) = 2 x 3 = 6

(vii) n(A xA) = n(A)  x n(A) = 3 x 3 = 9

(viii) n(B x B) = n(B) x n(B) = 2 x 2 = 4

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Find the values of x and y when
(x2--x, y-3y+2)=(0, 0)

(x-x, y-3y+2) = (0, 0)

rightwards double arrow        x-x = 0 or x(x-1)=0 or x = 0, 1

and y-3y+2 = 0 or (y-1) (y-*2) = 0 or y = 1, 2

Hence,  x = 0, x = 1, y = 1, y = 2

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Find the values of x and y when.
space space space space space space space space left parenthesis 2 straight x comma space straight x plus straight y right parenthesis space equals space left parenthesis 6 comma space 2 right parenthesis


 

(2x, x + y) = (6, 2)

rightwards double arrow   2x = 6  or x = 3

and       x + y = 2 or  3+y = 2 or y = -1

Hence, x = 3, y = -1

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Let A = {1,2,3},   space space space space space space space space straight B space equals space left curly bracket straight x space colon space straight x space is space even space prime space and space 10 space less or equal than space straight x space less or equal than space 27 right curly bracket
Find A X B

 


           A = {1, 2, 3}

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#6 {main}</pre>

The only even priome number is 2 and it  does not lie between 10 a nd 27.

∴                           space space space space space space space space space space space space straight B space equals space left curly bracket space right curly bracket space straight ϕ

space space space space space space space space space space space space space rightwards double arrow space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space straight A space space straight X space space space straight B space equals space straight A space straight X space straight ϕ space equals space straight ϕ

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If A = {1, 2}, B = {3, 4} and C ={x : x is even x divides 15}, that show that 

space space space space straight A space straight x space left parenthesis straight B intersection straight C right parenthesis space equals space straight ϕ


A = {1, 2}, B = {3, 4}

C = {x : xis even and x divides 15}

Since no even number divides 15

∴  space space space space space space space space space space space space space space straight C space equals space left curly bracket space right curly bracket space equals space straight ϕ

 rightwards double arrow space space space space space space space space space space    space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space straight B space intersection space straight C space equals space straight B space intersection space straight ϕ space equals space straight ϕ

space rightwards double arrow space space space space space space space space space space space space space space space space space space space space space space space space space straight A space straight x left parenthesis straight B intersection straight C right parenthesis space equals space straight A cross times straight ϕ equals straight ϕ

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