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

In a row of $35$ children,$M$ is $15^{th}$ from the right end and there are $10$ children between $M$ and $R.$ What is $R$'s position from the left end of the row?

If the first and second digits in the sequence $5, 9, 8, 1, 3, 2, 7, 4, 3, 8$ are interchanged,also the third and fourth digits,the fifth and sixth digits and so on,which digit would be the seventh counting to your left?

$A$ bus for Trivandrum leaves every $30 \,minutes$ from a bus stand. On enquiring,the clerk told a passenger that the bus had already left ten minutes ago and the next bus will leave at $9:35 \,am$. At what time did the clerk give this information to the passenger?

Count each $7$ which is not immediately preceded by $5$ but is immediately followed by either $2$ or $3.$ How many such $7's$ are there?
$5, 7, 2, 6, 5, 7, 3, 8, 3, 7, 3, 2, 5, 7, 2, 7, 3, 4, 8, 2, 6, 7, 8$

The Managing Director entered the conference room $10 \, \text{minutes}$ before $12:30 \, \text{hours}$ for interviewing. He came $20 \, \text{minutes}$ before the chairman who was $30 \, \text{minutes}$ late. At what time was the interview scheduled?