Question

n(A×B) = 20 and B = {1,2,3,4} then n(A) is

A) 6

B) 5

C) 4

D) 7

solution : ​

Answer 1

Answer:

n(axb)= 20 and b has 4 elements so 4 into 5 is 20 so n(a) is 5

Answer 2

Answer:

B)5

Step-by-step explanation:

Given

n(A×B) = 20 and B(1,2,3,4)

So,

n(B) = 4

n(A×4) = 20

Then

n(A) = 20/4

n(A) = 5