Question: answer the following questions 1). A, B, C and D are all different whole numbers between 1and13. Each whole number may only be used one

answer the following questions

1). A, B, C and D are all different whole numbers between 1and13. Each whole number may only be used one time.

What is the largest whole number thatA + B - C - Dcould represent?

2). A, B, C and D are all different whole numbers between 1and13. Each whole number may only be used one time.

What is the smallest whole number thatA + B - C - Dcould represent?

3). If n(A) = 21, n(B) = 12 and n(A B) = 7, what isn(AB)?

4). How many 1:1 correspondences are there between two sets that have 6 distinct elements each?

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