Answer:

Step-by-step explanation:
Given




Required

This is calculated as:

Since it is a selection without replacement, the computation is:

So, we have:




Answer: B 56
Step-by-step explanation:
Since units are same, they can be disregareded for now
12 to 10=12:10
treat as fraction
12/10=6/5
ratio is 6:5
Answer:
a: -1/7
b: 1/2
c: -1
d: none
Step-by-step explanation: