Question

if A=(1,2,3,4,5,6,7) and B=( 7,8,9,10 then 'A-B' equals option a) (7,9) b)(3,4,8,10) c) (7) d) none of these

​

Answer 1

Answer:

Option d None of these..

Answer 2

Answer:

• A-B is option D

Step-by-step explanation:

Find the DIFFERENCE of two sets .

• We find a DIFFERENCE of two sets by taking every element that is in the first set but not in the second set and putting all of these elements together into one set.
• To denote the DIFFERENCE of A and be we write: A-B or B-A. A-B is the set of all elements that are in A but NOT in B, and B-A is the set of all elements that are in B but NOT in A. Notice that A-B is always a subset of A and B-A is always a subset of B.
• The elements in only A are 1,2,3,4,5,6 .
• Thus, A-B is optionD