Given three sets P, Q and R such that: P = {x : x is a natural number between 10 and 16}, Q = {y : y is a even number between 8 and 20} and R = {7, 9, 11, 14, 18, 20} (i) Find the difference of two sets P and Q; (ii) Find Q – R; (iii) Find R – P; (iv) Find Q – P
Answers
Answer:
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P - Q = { 11, 13, 15 } ,
Q - R = { 10, 12, 16 } ,
R - P = { 7, 9, 18, 20} ,
Q - P = { 10, 16, 18 }
Given :
P = {x : x is a natural number between 10 and 16},
Q = {y : y is a even number between 8 and 20} and
R = {7, 9, 11, 14, 18, 20}
To find :
i) the difference of two sets P and Q;
(ii) Q – R;
(iii) R – P;
(iv) Q – P
Solution :
First, we need to declare all the elements of the sets P, Q and R
P = { 11, 12, 13, 14, 15}
Q = { 10, 12, 14, 16, 18 }
R = { 7, 9, 11, 14, 18, 20}
Difference of sets (A-B) means all the elements of A which are not present in B.
Hence,
i) difference of two sets P and Q (P - Q)
= { 11, 13, 15 }
ii) Q - R
= { 10, 12, 16 }
iii) R - P
= { 7, 9, 18, 20}
iv) Q - P
= { 10, 16, 18 }
HENCE,
P - Q = { 11, 13, 15 } ,
Q - R = { 10, 12, 16 } ,
R - P = { 7, 9, 18, 20},
Q - P = { 10, 16, 18 }
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