1:

4, 6, 9, 13,

A. | 15 |

B. | 12 |

C. | 18 |

D. | 17 |

The difference between two consecutive numbers is increasing in the order of 2,3, 4, 5, etc. |

2:

8, 20, 36, 56,

A. | 80 |

B. | 100 |

C. | 64 |

D. | 84 |

Every member of the series is,divisible by 4 and quotient is in the order of 2, 5, 9, 14, 20, i.e., it has an increasing trend with the difference of 3, 4, 5 and 6 |

3:

11, 33, 55, 77

A. | 99 |

B. | 88 |

C. | 121 |

D. | 101 |

Every member of the series is divisible by 11 and every next member is 22 greater than the preceding one. |

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