Question

U say answer that question ​

Answer 1

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Cardinal Number of a Set: The number of elements in a set is the cardinal number of that set. Notation: If a set A is equivalent to the set {1, 2, 3, …, N}, we write n(A) = N and say “The cardinal number of set A is N.” Also, n(Ø) = 0. The cardinal number for an empty set is zero.

Answer 2

b is akso.a but you need first minus a from b and c i

if you don't understand then download mathway link below