### Odds one Out

154, 235, 352, 460, 324

154

235

324

631

Sum of the digit in each number, except 324 is 10. Ex: 154 = 1+5+4 = 10

275, 132, 462, 396, 327, 891, 121

327

275

121

396

In each number except 327, the middle digit is the sum of the other two. Ex: 275 = 2+5 = 7(middle Number)

3, 5, 11, 14, 17, 21

21

17

14

3

All of them are odd execpt 14

8, 27, 64, 100, 125, 216, 343

27

100

125

343

The pattern is 2^{3}, 3^{3}, 4^{3}, 5^{3}, 6^{3}, 7^{3}. But, 100 is not a perfect cube.

10, 25, 45, 54, 60, 75, 80

10

45

54

75

Each of the numbers except 54 is multiple of 5.

396, 462, 572, 427, 671, 264

396

427

671

264

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

6, 9, 15, 21, 24, 28, 30

28

21

24

30

Each of the numbers except 28, is a multiple of 3.

1, 4, 9, 16, 23, 25, 36

9

23

25

36

Each of the numbers except 23, is perfect square.

1, 4, 9, 16, 20, 36, 49

1

9

20

49

The pattern is 12, 22, 32, 42, 52, 62, 72. But, instead of 52, it is 20 which to be turned out.

2, 5, 10, 17, 26, 37, 50, 64

50

26

37

64

(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.

10, 14, 16, 18, 21, 24, 26

26

24

21

18

Each of the numbers except 21 is an even number.

16, 25, 36, 72, 144, 196, 225

36

72

196

225

Each of the numbers except 72 is a perfect square.

331, 482, 551, 263, 383, 362, 284

263

383

331

551

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

41, 43, 47, 53, 61, 71, 73, 81

61

71

73

81

Each of the numbers except 81 is a prime number.