Look at this series: 7, 10, 8, 11, 9, 12, . . . What number should come next?

a. |
7 |

b. |
10 |

c. |
12 |

d. |
13 |

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Look at this series: 7, 10, 8, 11, 9, 12, . . . What number should come next?

a. |
7 |

b. |
10 |

c. |
12 |

d. |
13 |

Test ID: 551

Source: 501 challenging logic & reasoning problems

b. This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.