For any event $A$,which of the following is true?

If out of $20$ consecutive whole numbers two are chosen at random,then the probability that their sum is odd,is

$A$ bag contains $4$ white,$5$ black,and $6$ red balls. If a ball is drawn at random,what is the probability that the drawn ball is either white or red?

If two balanced dice are tossed once,the probability of the event,that the sum of the integers coming on the upper sides of the two dice is $9$,is

In a single throw of two dice,the probability of obtaining an odd number as the sum is

In a lottery,there were $90$ tickets numbered $1$ to $90$. Five tickets were drawn at random. What is the probability that two of the tickets drawn are numbered $15$ and $89$?