Question

Suppose A ={2, 5, 7, 9, 13, 25, 26}. True or False: {1,2,3}⊆A

Answer 1

Step-by-step explanation:

n(A) is the number of elements is A, sometimes written |A|.  I count 7.  n(A)=7

13 is among the elements of A, so 13 ∈ A  is TRUE

26 is among the elements of A, so 26 ∉ A   is FALSE

10 isn't in A, so 10 ∉ A  is TRUE

PLS MARK BRAINLEST