Hey there!
Your probability of you receiving a red colored marble would 3/9.
Have a nice day fam ;)
Consider the intergers as, x and x+1
x+(x+1)=31
2x+1=31
2x=30
x=15
So, (x+1)=(15+1)=16 would be larger number.
Im guessing you meant improper. This means that the numerator is greater than the denominator. An example is 11/4