If a = {3, 5, 7, 9, 11} and B = {4, 7, 10}, Find: N(B) - Mathematics

If A = {3, 5, 7, 9, 11} and B = {4, 7, 10}, find: n(B)

One Line Answer

n(B) = (4, 7, 10) = 3

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Universal Set

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Chapter 13 Set Concepts (Some Simple Divisions by Vedic Method)
Exercise 13 (D) | Q 2.2

Which set of numbers could be the universal set for the set given below?

Given the universal set = {-7,-3, -1, 0, 5, 6, 8, 9}, find: A = {x : x < 2}

Given the universal set = {x : x ∈ N and x < 20}, find:

C = {x : x is divisible by 4}

Given, universal set = {x : x ∈ N, 10 ≤ x ≤ 35}.
A = {x ∈ N : x ≤ 16} Find: A'

For the universal set {4, 5, 6, 7, 8, 9, 10, 11,12,13} ; find the subset of C = {prime numbers}.
Also, find a complement of C.

If A = {4, 5, 6, 7, 8} and B = {6, 8, 10, 12}, find: A∪B

If A = {3, 5, 7, 9, 11} and B = {4, 7, 10}, find: n(A)

If A = {3, 5, 7, 9, 11} and B = {4, 7, 10}, find: A∪B and n(A∪B)

If A = {3, 5, 7, 9, 11} and B = {4, 7, 10}, find: (A – B) and n(A – B)

If A = {3, 5, 7, 9, 11} and B = {4, 7, 10}, find: n (B)