Study the letter series and answer the question that follows. K I O X J E T R U L E B A C K J M N How many such vowels are there, each of which is immediately followed by at least two consonants appearing together in the above series?

The vowels in the series are: I, O, E, U, E, A Step 2: Check if each vowel is followed by at least two consonants together I → Followed by O (vowel) → O → Followed by X J (both consonants) → E → Followed by T R (both consonants) → U → Followed by L (consonant), E (vowel) → E → Followed by B (consonant), A (vowel) → A → Followed by C K (both consonants) → Step 3: Count the valid cases The vowels satisfying the condition are O, E, A.   Thus, the correct answer is 3.