In a throw of a die, what is the probability of getting a number less than $7$

From a well shuffled pack of cards one card is drawn at random. The probability that the card drawn is an ace is

There are $4$ envelopes with addresses and $4$ concerning letters. The probability that letter does not go into concerning proper envelope, is

Two dice are thrown. The events $A, B$ and $C$ are as follows:

$A:$ getting an even number on the first die.

$B:$ getting an odd number on the first die.

$C:$ getting the sum of the numbers on the dice $\leq 5$

Describe the events $A$ and $B$

Two dice are thrown. If first shows $5$, then the probability that the sum of the numbers appears on both is $8$ or more than $8$, is

The probability of getting head and tail alternately in three throws of a coin (or a throw of three coins), is