दी गई अक्षरांकीय श्रृंखला (alpha-numeric series) में प्रश्न चिह्न (?) के स्थान पर क्या आना चाहिए? 2M, 5O, 10R, 13T, 18W, 21Y, ?

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

Refer to the following letter-symbol series and answer the question. Counting is to be done from left to right only. (Left) & € # Y J £ M & N K V £ N % % & # Z P * J I (Right) How many such symbols are there each of which is immediately preceded by a letter and also immediately followed by a symbol?