In all other groups, last number between first and second letters is twice the sum of positions of first and last letters in the alphabet.
All other except '525' are cubes of some numbers.
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
Except option (d), all letters in options having same difference among them.
Except option (d), all letters in pairs having difference of four.
Except 'Garden' all the others are the parts of a tree.
In other numbers, second number is one less then the square of first number .(3)2 = 8.(6)2 = 35...... and son on .
The word in all other pairs are antonyms of each other.
Except 'Record' all the terms are related to secret system of sending messages.
Except '72' all the other give a prime number, when divided by 2.
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