Refer to the following number and symbol series and answer the question. Counting is to be done from left to right only. (All numbers are single-digit numbers only.) (Left) 3 6 2 £ 4 9 + 7 ~ 1 # % $ 5 ? & = * Ω 8 @ (Right) How many such symbols are there, each of which is immediately preceded by an odd number but not immediately followed by an even number?

Refer to the following number series and answer the question. (Left) 2 8 9 3 5 7 6 3 1 4 8 9 3 5 1 5 6 2 1 4 7 5 2 3 8 2 9 (Right) How many such odd digits are there, each of which is immediately preceded by an odd digit and also immediately followed by an even digit?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? CAR78, GEV86, KIZ94, OMD102, ?