If the word ‘DEVANS’ is concatenated with its reverse letters, then find the number of pairs of adjacent letters which appear in the ascending alphabetical order.?

Option 3 : Five

1) The arrangement of the word after serialization is:

[ alt="Position of letter in word Devans Somani 11Oct2018 10Q hindi hrev images Q7" src="//storage.googleapis.com/tb-img/production/18/10/Position%20of%20letter%20in%20word_Devans%20Somani%20_11Oct2018_10Q%20hindi_hrev_images_Q7.PNG" style="height:38px; width:356px">

2) The number of pairs of adjacent letters which appear in the ascending alphabetical order:

[ alt="Position of letter in word Devans Somani 11Oct2018 10Q hindi hrev images Q7a" src="//storage.googleapis.com/tb-img/production/18/10/Position%20of%20letter%20in%20word_Devans%20Somani%20_11Oct2018_10Q%20hindi_hrev_images_Q7a.PNG">

E comes after D and both are placed together so DE is one pair. In a similar pattern V come after E and both are placed together so EV is 2nd pair.  In a similar pattern, N comes after A and both are placed together so AN is 3rd pair and so on.