Question

In a survey of college students, it was found that:
356 owned an iPod
293 owned a laptop
285 owned a gaming system
193 owned an iPod and laptop
200 owned an iPod and gaming system
139 owned a laptop and a gaming system
68 owned an iPod, laptop and gaming system
26 owned none of these devices

Of the college students surveyed, how many owned

a) exactly two of these devices
b) at least one of these devises

I am not sure if I am supposed to figure out how many students were surveyed to be able to solve this or what.

Answer 1

draw a venndiagram

Answer 2

then you can calculate the numbers of two items, and then the number of only one item and at least the number of none item

Answer 3

get it?