What will come in place of (−)? 1, 4, 3, 8, 7, 12, −, 16, 21

How many pairs of consecutive numbers are there in the following number sequence each of which is in ascending order (Like 1, 2)?
7 6 7 8 6 7 5 6 8 7 7 8 6 5 4 5 6 3 4

Select the number from among the given options that can replace the question mark (?) in the following series.
36, 75, 147, 297, 591, ?

In the following question, select the missing number from the given series.
4, 15, 2, 17, ?, 19

The successor of a number is related to the predecessor in some way. The missing numbers in the given pattern is 2, 5, 7, 12, 19, 31, __, __

Choose the correct alternatives that will continue the same pattern and replace the question mark (?), in the following number series.
99, 33, 36, 12, 15, 5, ?

Complete the given series:
362, 364, _, 368, 370