Adi remember that his sister Ana's date of birth falls after 20th September but before 23rd September, while his father remember that Ana's birthday falls after 21st and before 24th September. What is the correct date of birth of Ana?

The pattern is (6, (6)² = 36, Reverse of 2nd 's digits = 63) and option (b) has (8, (8)² = 64, Reverse is 46).

'Kangra' is the name of a valley and others are mountain ranges of North-East

Except 8-15, in all the option, both of the numbers are the squares of consecutive natural numbers.

8 + 3 = 11 ; 1 + 3 = 4
7 + 3 = 10 ; 3 + 3 = 6 ? 5

In all other groups, there is a gap of two letters as in the alphabet between the second and the third letters.

In all other groups, there is a gap of one letter as in the alphabet between second and third letters.

IN all other groups, there is a gap of one leter as in the alphabet between first abd second letters.

In all other group of letters, there is no gap between first and second letters, gap of one letter between second and third letter, gap of two letters between third and fourth letters.

In all other groups, letters adjacent to the middle one are equidistant from in the alphabet.

In all other groups, there is a gap of two letters between second and third letters as in the alphabet.