Here's another one.
See the attached picture.
Sorry cant help you, that's a tough nut to crack! good luck though!
Answer:
Step-by-step explanation:
We are given the letters:
2
We write the possible permutations of 3 letters from the given list:
3
Because order is not important in a combination we cross out the duplicate pairs:
4
The one on the left is -5/6
The one on the right is 1/21