Aptitude Odd Man Out Series Practice QA

In each number except 427, the middle digit is the sum of other two.

(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1

But, 64 is out of pattern.

In each number except 383, the product of first and third digits is the middle one.

In each number except 751, the difference of third and first digit is the middle one.

Each of the numbers except 81 is a prime number.

In all numbers except 344, the product of first and third digits is the middle digit.

All given numbers except 1 are prime numbers

One is not a prime number because it does not have two factors. It is divisible by only 1

The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5

Hence, in place of 40, right number is 37+5=42

6 x 2 + 2 = 14

14 x 3 + 3 = 45

45 x 4 + 4 = 184

184 x 5 + 5 = 925

925 x 6 + 6 = 5556

Hence, it is clear that 184 should have come instead of 185

23 + 2² = 27

27 + 3² = 36

36 + 4² = 52

52 + 5² = 77

77 + 6² = 113

113 + 7² = 162

Hence, 113 should have come in place of 111