# Number Series Questions for Canara Bank Po 2018 Set-2

January 16, 2018

**Direction (Q.1-5): What will come in place of the question mark (?) in the following number series?**

**Q.1 8640, ?, 2160, 240, 15, 0.6**

(A) 8640

(B) 8460

(C) 6840

(D) 4680

(E) 4068

**Q.2 12512, 5792, 4832, 4672, ?, 4632**

(A) 3620

(B) 3850

(C) 4250

(D) 4640

(E) None of these

**Q.3 4, 8, 15, 28, 53, ?**

(A) 96

(B) 105

(C) 88

(D) 121

(E) None of these

**Q.4 10, 4, 2, 0, -8, ?**

(A) 80

(B) − 80

(C) − 20

(D) − 50

(E) 50

**Q.5 16, 21, 26, 46, ?, 3106**

(A) 136

(B) 196

(C) 226

(D) 262

(E) 362

**Answer 1. (A) 8640**

**Explanation:**

Pattern |
Series |

8640 | 8640 |

8640 ÷ 1^{2} |
8640 (✓) |

8640 ÷ 2^{2} |
2160 |

2160 ÷ 3^{2} |
240 |

240 ÷ 4^{2} |
15 |

15 ÷ 5^{2} |
0.6 |

**Answer 2. (D) 4640**

**Explanation:**

Series |
: |
12512 | 5792 | 4832 | 4672 | 4640 |
4632 | |||||

Pattern |
: |
6720 | 960 | 160 | 32 | 8 | ||||||

÷ 7 | ÷ 6 | ÷ 5 | ÷ 4 |

**Answer 3. (E) None of these**

**Explanation:**

Pattern |
Series |

4 | 4 |

4 × 2 − 0 | 8 |

8 × 2 − 1 | 15 |

15 × 2 − 2 | 28 |

28 × 2 − 3 | 53 |

53 × 2 − 4 | 102 (✓) |

**Answer 4. (B) − 80**

**Explanation:**

Pattern |
Series |

10 | 10 |

10 × 0.5 − 1 | 4 |

4 × 1 − 2 | 2 |

2 × 2 − 4 | 0 |

0 × 4 − 8 | − 8 |

− 8 × 8 − 16 | − 80 (✓) |

**Answer 5. (C) 226**

**Explanation:**

Series |
: |
16 | 21 | 26 | 46 | 226 |
3106 | |||||

Pattern |
: |
5 | 5 | 20 | 180 | 2880 | ||||||

×1^{2} |
×2^{2} |
×3^{2} |
×4^{2} |