If number of two-digit numbers which are of the form xy with `y

The number of two digit numbers which are prime :

The number of 5 digit numbers of the form xyzyz in which x < y is

The number of three digit numbers of the form xyz where x>y>z is

Generalised form of a two-digit number xy is

The successor of a two-digit number is always a two-digit number.

The number of 5-digit numbers in which no two consecutive digits are identical, is

Predecessor of a two digit number is always a two digit number.

Number of 6 digit numbers that can be formed using digit 2 two times and the digit 5 four times is

The number of two digit numbers which on being reversed (i.e., their digits exchanged the position) gives out perfect square two digit numbers: