Question

If U = {1, 2, 3, ..., 40} and A = {x :x is a factor of 42}, then write n(A).

Answer 1

Answer:

n(A)= 7

Step-by-step explanation:

A= { 1,2,3,6,7,14,and 21},, I have write less than 40 factors of set A because Universal set is till 40..