Answer:
10:40
Step-by-step explanation:
3x4 = 12
4 x 4 = 16
5 x 4 = 20
so 10 x 4 = 40 (10:40)
The probability of the first pull is

The probability of the second pull is
Answer:
2a to the second power + 3a
Step-by-step explanation:
There are many combinations if the numbers are not required to be integers.
If they are required to be integers, I'd suggest:
3*7*3 = 63