Answer:
Explanation:
Person who wears a watch + ring
Lets say the fraction of people wearing the rings is 1/X
Lets say the fraction of people wearing a watch is 2/y
The formula is multiplication for both (Key words: and)
The formula is add for one or the either (key words: or)
The question says that person wears a watch given that they wear a ring
It mean that they wear a watch + a ring.
THat mean multiplication!
Lets use the example: 1/x · 2/y = 2/xy
This makes 2/xy your answer for the example.
Now lets do another example:
Lets say the fraction of people wearing the rings is 1/3
Lets say the fraction of people wearing a watch is 2/3
Multiplication!!!!
1/3 x 2/3 = 2/9
This makes 2/9 your answer to this example!!!!
Hope I helped a lot!!!!!!!!!!!!!!!!!!