Look at this series: 31, 29, 24, 22, 17, . . . What number should come next?

a. |
15 |

b. |
14 |

c. |
13 |

d. |
12 |

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Look at this series: 31, 29, 24, 22, 17, . . . What number should come next?

a. |
15 |

b. |
14 |

c. |
13 |

d. |
12 |

Test ID: 539

Source: 501 challenging logic & reasoning problems

a. This is a simple alternating subtraction series, which subtracts 2, then 5.