Look at this series: 4, 7, 25, 10, __, 20, 16, 19,… What number should fill the blank?

a. |
13 |

b. |
15 |

c. |
20 |

d. |
28 |

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Look at this series: 4, 7, 25, 10, __, 20, 16, 19,… What number should fill the blank?

a. |
13 |

b. |
15 |

c. |
20 |

d. |
28 |

Test ID: 572

Source: 501 challenging logic & reasoning problems

a. Two series alternate here, with every third number following a different pattern. In the main series, 3 is added to each number to arrive at the next. In the alternating series, 5 is subtracted from each number to arrive at the next.