# math

posted by
**Karinna**
.

input:1 output:4

input:2 output:7

input:3 output:10

input:4 output:13

What is the rule?

posted by
**Karinna**
.

input:1 output:4

input:2 output:7

input:3 output:10

input:4 output:13

What is the rule?