Complete the series by choosing the right option: U, O, I, ____?

What should be written in the place of question mark in the given series?
G3, 16, ?, M12, 015

Find the next term in given series.
UNDERSTAND, ERST, NDERSTAN, RS, ?

Find the next term in the given series.
D17, 124, N31, S38, ?

What will be written in the place of question mark in the given series?
C3J10S19D4?16

Find the missing term: AZY, BXW, CVU, DTS, ?, FPO.

How many even numbers are there in the following number sequence which are preceded and succeeded by an odd number?
1 2 3 3 2 1 4 2 3 1 4 2 2 3 3 1 4 1

1 is subtracted from each even digit of the number 95423671. Find the number of digits that are repeated more than once in the new number formed

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