Except 'Bat' all the others are birds but bat is a mammal.
143 ? 122 - 1,257 ? 162 + 1, 195 ? 142 - 1, 15 ? 42 - 1,
Hence, '257' is odd one.
Except '98' ,all other are multiples of 6.
84 ? 6 x 14, 120 ? 6 x 20,72 ? 6 x 12,108 ? 6 x 18
Except '384' , all the others are perfect Cube of natural number.
Except '225' , all the other are perfect squares of natural numbers.
Except '189', all the others are square number.
25 ? 52, 64 ? 82, 225 ? 152 and 121 ? 112
Except 'tree' , all the other are its parts.
Except '117' all the others give a prime number when divided by 3.
Except 'Fram', all the others are form a plants.
Except 'Calculator', all the others are stationary items that work mechanically, while calculator works electronically.
Except '27', all the others are prime numbers.
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