Students are sitting in a row in which the position of X is 17th from the left and that of Y is 14th from the right. If they interchange their positions, X's position becomes 7th from the left. How many students are there in the row?
In the given sequence, if every letter beginning from position 8 from the left is replace by its next letter in the English alphabet., and Z is replaced by A, then how many Vs will be there in the resulting sequence?