Set Concepts — Formula Sheet
ICSE · Class 7 · Mathematics
9 formulas from Set Concepts (ICSE Class 7 Mathematics) on one page, grouped by topic. Part of the ICSE Class 7 Mathematics syllabus.
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Formulas and Key Relations
Subsets and Proper Subsets
A ⊆ B
B ⊇ A
A ⊂ B
Number of subsets = 2^n
Cardinal Number
n(A) = number of elements in A
n(A ∪ B) = n(A) + n(B) - n(A ∩ B)
Cardinal Number and Types of Sets
If a set A has 5 elements, then n(A) = 5.
If B = {0}, then n(B) = 1 because 0 is an element of the set.
n(A) = 5 if a set A has 5 elements.
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