Question
 In the word ‘DEVASTATE’ all consonants are written
as their preceding letter and all vowels are written as their following letters. Now all letters are arranged in alphabetical order from left to right and all the repeated letters are eliminated. Then, how many such pairs of letters are there, each of which have as many letters between them in the word (forward direction) as they have between them in the English alphabetical series?Solution
The word - D E V A S T A T E
    C F U B R S B S F
    B B C F F R S S U
    B C F R S U
Only BC and RS are there for the forward arrangement. Â
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