In each of the following cases state whether x ∈ A, x ⊆ A, both or neither: _____________ 9. x = {1}; A = {1, 2, 3} _____________ 10. x = {1}; A = {{1}, {2}, {3}} _____________ 11. x = {1}; A = {1, 2, {1, 2}} _____________ 12. x = {1, 2}; A = {1, 2, {1, 2}} _____________ 13. x = {1}; A = {{1, 2, 3}} _____________ 14. x = 1; A = {{1}, {2}, {3}}

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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In each of the following cases state whether x ∈ A, x ⊆ A, both or neither: 
 
_____________ 9. x = {1};                    A = {1, 2, 3}
_____________ 10. x = {1};                  A = {{1}, {2}, {3}}
_____________ 11. x = {1};                  A = {1, 2, {1, 2}}
_____________ 12. x = {1, 2};              A = {1, 2, {1, 2}}
_____________ 13. x = {1};                  A = {{1, 2, 3}}
_____________ 14. x = 1;                    A = {{1}, {2}, {3}} 

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