उस विकल्प का चयन कीजिए जो दी गई श्रृंखला में प्रश्न चिह्न (?) को प्रतिस्थापित करके श्रृंखला को तार्किक रूप से पूरा करेगा। XV4 SQ9 NL16 ?

What should replace the question mark (?) in the given series to complete it logically? 4-B-D, 8-C-E, 16-D-F, ?, 64-F-H

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 only. (Left) \ % * 5 5 / 9 9 / + 7 * # 6 9 6 @ + 7 ? + (Right) How many such symbols are there, each of which is immediately preceded by a number and also immediately followed by a number?