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Question

Refer to the following letter series and answer the question. Counting to be done from left to right only.

(Left) P E R G T F V N J I O K U Y H K Y T B H R D T V W (Right)

How many such consonants are there each of which is immediately preceded by a vowel and also immediately followed by a consonant?

The correct answer is

Two

The vowels are A, E, I, O and U; every other letter, including Y, is a consonant. So first locate each vowel in the series and then look at the letter that comes right after it.

The vowels in the series appear at these places: E (2nd letter), I (10th letter), O (11th letter) and U (13th letter). The letter after each vowel must itself be a consonant, and the letter after that must also be a consonant.

E → R → G: R is a consonant preceded by the vowel E and followed by the consonant G, so R qualifies. I → O: O is a vowel, so nothing qualifies here. O → K → U: K is preceded by O but followed by the vowel U, so K does not qualify.

U → Y → H: Y is a consonant preceded by the vowel U and followed by the consonant H, so Y qualifies. Therefore the qualifying consonants are R and Y, i.e. 2 consonants.

Check: these are the only vowels in the series (P E R G T F V N J I O K U Y H K Y T B H R D T V W has no A and no other E, I, O or U), so each case has been tested and the count of qualifying consonants is exactly 2.

Hence, Two.

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Important Questions from Alphabet Series

  1. A series is given with some letters missing. Choose the correct alternative from the given ones that will complete the series:

    BR __ __ NB __ O __ NB
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    a __ __ dba __ __ bcad __ __ da __ __ cd
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    _ a _ b _ abaa _ bab _ abb
  4. In the series _b_a_ba_b_abab_aab;

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  5. In the series AABABCABCDABCDE..., which letter appears at the 100th place?

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