दी गई श्रृंखला को तार्किक रूप से पूरा करने के लिए निम्नलिखित में से कौन सा अक्षर-संख्या समूह प्रश्नवाचक चिह्न (?) को प्रतिस्थापित करेगा? CKR 78, HHM 69, MEH 60, RBC 51, ?

Refer to the following letter series and answer the question. (Counting is to be done from left to right only). (Left) Z M L Q B X K C H A W V N T R Y D F J P I A U K E O X Z (Right) How many such vowels are there, each of which is immediately preceded by a vowel and immediately followed by a vowel?

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) 2 ^ 7 ? $ % < ? 4 3 \ & * @ # < 6 7 + 3 # (Right) How many such numbers are there, each of which is immediately preceded by a symbol and also immediately followed by a symbol?