Question

Calculate the number of elements belonging to the sets described below:

n(A)=13n
(A∩B)=8n
(A∪B)=20
Determine n(B)

Answer 1

use the fact that\[(A\cup B)=n(A)+n(B)-(A\cap B)\]

Answer 2

Still not 100% sure

Answer 3

i think the answer would not be in a decimal but it would be in an whole number

Answer 4

what do u think ???

Answer 5

@Julie275 do u think the answer would be in decimal ????

Answer 6

No I don't

Answer 7

are u in school or college

Answer 8

@Julie275 i asked u are in school or college

Answer 9

school

Answer 10

which grade

Answer 11

@Julie275 which grade u

Answer 12

@Julie275 what tell me u in which grade

Answer 13

fast

Answer 14

i dont have much time

Answer 15

12

Answer 16

oh i am in 2 grade you are older than me

Answer 17

a lot older

Answer 18

dont ask this hard question ask questions like - what is 4 + 8