Except '78', if you subtract 1, all the others give a prime number.
All other are adjectives denoting size.
In all others, 1st letter + 3 = 2nd letter
And, 1st letter - 2 = 3rd letter
In SLEEP,SHEEP and GREED,place of 'EE' is second from the right end while in TEETH,EE is second from the left end.
Except 'IM', in all the other, there is a gap of two letters.
Except 'Flute' , all other are string instruments.
Except 'Sweet', all the others are baked items.
83 is the only number which is prime, while others are composite numbers.
Except '39', all the others are prime numbers, while 39 is a composite number
As, 39 ? 13 x 3
Except '189', all the others are square number.
25 ? 52, 64 ? 82, 225 ? 152 and 121 ? 112
Except '225' , all the other are perfect squares of natural numbers.
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