Question

Set theory

Answer 1

you mean the thing that deals with formal properties ?

Answer 2

well how can you even get the total number of student if it dosen't state exactly how many student there is in marketing?

Answer 3

oh lol that part was kinda missing on my screen

Answer 4

still it is just a 2 digit number above 50 it could be anything so without an exact number you could pick either a,b or c but doesn't make them correct

Answer 5

it is above 50 and less than 120

Answer 6

which to lead to any of the answer lets see a you would get what? 75?
second 65?
third 79?
just by taking the numbers in general and subtracting everyone to get a specific 0.o

Answer 7

fine @ganeshie8 you figure it out cause i feel dumb right now

Answer 8

i think u r talking trial and error