Answer:
It's the first one because 5 x 3 = 15 and 10 x 3 = 30 and 15 x 3 = 45 and so on..
Step-by-step explanation:
The first one answer, because pattern X is 3 times the corresponding term in pattern Y.
5 x 3= 15
10 x 3=30
15 x 3= 45
20 x 3=60
