look at the pattern and find the missing number?
a) 3/4\2
---
4
b) 15/6\13
---
3
c) 17/8\13
---
2
d) 12/?\10
---
2
a) 3/4\2
---
4
b) 15/6\13
---
3
c) 17/8\13
---
2
d) 12/?\10
---
2