In the series,$6, 4, 1, 2, 2, 8, 7, 4, 2, 1, 5, 3, 8, 6, 2, 1, 7, 1, 4, 1, 3, 2, 8, 6$,how many pairs of successive numbers have a difference of $2$ each?

How many even numbers are there in the following sequence of numbers which are immediately followed by an odd number as well as immediately preceded by an even number?
$8, 6, 7, 6, 8, 9, 3, 2, 7, 5, 3, 4, 2, 2, 3, 5, 5, 2, 2, 8, 1, 1, 9$

Below is given a number series:
$1, 8, 5, 7, 2, 9, 8, 4, 3, 6, 2, 7, 5, 1, 8, 9, 4, 3, 6, 5, 9$
How many instances are there in which an even number is followed by two odd numbers?

In a school,the following codes were used during physical exercise. $1$ means 'start walking',$2$ means 'keep standing',$3$ means 'start running at the same spot',$4$ means 'sit down'. How many times will a student who performs the following sequence without error from the beginning to the end have to sit down?
$1, 2, 3, 4, 2, 3, 1, 4, 4, 3, 2, 2, 1, 2, 4, 3, 1, 4, 4, 1, 2$

If the first day of the year (other than a leap year) was Friday,then what was the last day of that year?

If the numbers from $5$ to $85$ which are exactly divisible by $5$ are arranged in descending order,which number would be at the eleventh place from the bottom?