Hello, thank you for taking the time to post your question!
I think it helps to separate it by numerator and denominator … so on this one it becomes
5/6 x 4/5 x 3/2
= (5 x 4 x 3) / (6 x 5 x 2)
= 60 / 60
= 1
I hope that helps you get moving in a better direction on this type of question! Feel free to reach out if you have any additional questions beyond that :)