For any given finite set LaTeX: SS, let LaTeX: n\left(S\right)n ( S ) denote the number of elements it contains. Given any two finite sets LaTeX: AA and LaTeX: BB 1. Prove that LaTeX: n\left(A\cup B\right)=n\left(A\right)+n\left(B\r ight)-n\left(A\cap B\right)n ( A ∪ B ) = n ( A ) + n ( B ) − n ( A ∩ B ) 2. Determine the corresponding formula for LaTeX: n\left(A\cup B\cup C\right)n ( A ∪ B ∪ C ), where LaTeX: A,\:B,\:\text{and}\:CA , B , and C are finite sets

just needed some points but try socratic

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column

hard

step-by-step explanation:

the answer is c

step-by-step explanation: i took a test with this question on it