1) Consider the sets A = {1,a,3}, B = {1,b,2,d}, C = {0, 1, 7}. What is the valu

Question

1) Consider the sets A = {1,a,3}, B = {1,b,2,d}, C = {0, 1, 7}. What is the value of B - A?

a) {b,2,d}

b) {b,2,d,a,3}

c) {1,b,2,d,3}

d) None of the above

2) Consider the sets A = {1,a,3}, B = {1,b,2,d}, C = {0, 1, 7}. What is the value of A – B?

a) {a,3,b,2,d}

b) {a,3}

c) {b,2,d}

d) {1,a,3,2,d}

3) Is the following a function? If it is not, say why not. If it is a function, state whether it is onto.

a)It is a function, but it is not onto

b)It is not a function because one element in the codomain does not have a relation from the domain.

c)It is not a function because one of the elements in the domain does not have a relation to an element in the codomain.

d)None of the above

4) True or False:

The following ia a function that is 1 to 1.

Explanation / Answer

1)A={1,a,3}

B={1,b,2,d}

B-A ={1,b,2,d} - {1,a,3}

={b,2,d}

2)

A-B={1,a,3} - {1,b,2,d}

= {a,3}

3)

c) It is not a function because on of the element in the domain is not related to the element in the codomain.

If it is a function all the elements in the domain must be related to the element in the codomain.

4)

False this is many to one

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