Study the given number series and answer the question that follows.
2 6 7 4 9 3 6 5 1 9 5 2 4 5 9 4 2 3 7 1
How many even numbers are immediately preceded by an odd number and immediately followed by a prime number?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?

STQ 54, NOL 61, IJG 68, DEB 75, ?

Find the next term in the following series:
Z1A, X2D, V6G, T21J, R88M, P445P, ?

What will come in place of question mark(?) in the following series?
X5C, U8F, ?, O17L, L23O

Look at the series given below:
F2,?, D8, C16, B32
What number should fill in the blank?

Find the next term in the following series:
Z1A, X2D, V6G, T21J, R88M, P445P, ?

Refer to the following number and symbol series and answer the question that follows. Counting to be done from left to right only. All numbers are single-digit numbers.
(Left) % 4 6 1 * @ 8 $ 7 & Ω 9 # 2 + 3 £ 5 (Right)
How many such symbols are there, each of which is immediately preceded by a number and also immediately followed by another number?

Refer to the following number series and answer the question that follows (all numbers are single-digit numbers only). Counting to be done from left to right only.
(Left) 8 5 1 7 3 5 2 8 7 6 9 8 (Right)
How many such odd numbers are there, each of which is immediately preceded by an odd number and also immediately followed by an even number?

Refer to the following number series and answer the question that follows (all numbers are single-digit numbers only). Counting to be done from left to right only.
(Left) 9 3 8 9 8 9 3 4 4 4 5 1 2 3 6 8 3 2 9 6 2 9 1 4 9 2 1 (Right)
How many such odd numbers are there, each of which is immediately preceded by an even number and also immediately followed by an even number?