Answer:

1.B

2.E

3.C

4.D

5.A

Step-by-step explanation:

Each digit is exampled by 1,2,3,4

Example:2, 5, 8, 11= 2 is 1, 5 is 2, 8 is 3, and 11 is 4

1. 3N-1= 3×1-1 =2, 3×2-1=5

2. I have no explanation

3.6N= 6×1=6, 6×2= 12

4.7N-2= 7×1-2=5, 7×2-2=12

5.On this one,the original number is used

N+1=10+1=11, 11+1=12