Answer: Third Option

Step-by-step explanation:
In this case, we have two non-disjoint events.
So the probability of M or N occurring is

We know that in this problem


So


The answer is the third option
Lin's number = l
pazi's number = p
l = p + 7
p = p
p + 7 + p = 49
2p + 7 = 49
2p + 7 (-7) = 49 (-7)
2p = 42
2p/2 = 42/2
p = 21
l = p + 7
l = 21 + 7
l = 28
pazi is 21 years old, Lin is 28 years old
hope this helps
Answer:
D
Step-by-step explanation: