# odd man out of series aptitude questions

11. | 331, 482, 551, 263, 383, 362, 284 | |||||||

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

12. | 835, 734, 642, 751, 853, 981, 532 | |||||||

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

13. | 41, 43, 47, 53, 61, 71, 73, 81 | |||||||

Each of the numbers except 81 is a prime number. |

14. | 3, 5, 7, 12, 17, 19 | |||||||

Each of the numbers is a prime number except 12. |