How many pairs of letters are there in the word 'HORIZON' which have as many letters between them in the words as in the English alphabet?
If we check from both directions that is in forward and backward direction the answer is "three". As starting from H to N the total number of letter in given word are five and in alphabetical series also the total number of letter between H and N are five that is I, J, K, L, M and then N comes.
So this is one pair
If we check in backward direction from N to O there is no gap between them and in alphabetical series also after N, O comes. This is second pair.
And last pair is again in backward direction from O to R, the total number of letters in between are two and in alphabetical series also the total number of letters are two that is after O P,Q and then R comes.