Let u = {1,2,3,4,5,6,7,8,9,10).
let a={1,2,4,6,9)
let b = {1,3,4,5,8)
determine (a - b)'.

The difference set is the set of all elements that belongs to A, but not to B. These elements are

The complementary set is to be considered with respect to the universe set U, so we have to consider all the elements of the universe that are not in our set:

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,

answer: x=60