दिए गए विकल्पों में से उस पद का चयन कीजिए जो निम्नलिखित श्रृंखला में प्रश्न चिह्न (?) को प्रतिस्थापित कर सकता है। NPN23, KQP21, HRR19, ?, BTV15

Refer to the following letter series and answer the question that follows. Counting to be done from left to right. (Left) S I C X Z O A K L N T E W A Q D F H G U K O (Right) How many such consonants are there, each of which is immediately preceded by a vowel and also immediately followed by a vowel?

Refer to the following letter and symbol series and answer the question. (Counting is to be done from left to right only): (Left) J W @ M E V ~ & P T ¥ G R Y € ! K C ◇ A D £ % B F $ I S L < Q % X Z (Right) How many such symbols are there each of which is immediately preceded by a letter and also immediately followed by another symbol?