2 D class notes
Q.1. the breadth of a rectangular hall is three - fourth of its length . If the area of the floor is 192 meter square , then the difference between the length and breadth of the hall is
a. 8 meter
b. 12 meter
c.4 meter
d. 32 meter
Set theory begins with a fundamental binary relation between an object o and a set A . If o is a member (or element ) of A , the notation o ∈ A is used. [7] A set is described by listing elements separated by commas, or by a characterizing property of its elements, within braces { }. [8] Since sets are objects, the membership relation can relate sets as well. A derived binary relation between two sets is the subset relation, also called set inclusion . If all the members of set A are also members of set B , then A is a subset of B , denoted A ⊆ B . [7] For example, {1, 2} is a subset of {1, 2, 3} , and so is {2} but {1, 4} is not. As implied by this definition, a set is a subset of itself. For cases where this possibility is unsuitable or would ma...
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