Complete the series.
167, 334, 668, 1336, (...)

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