# Number Series Asked in Syndicate Bank PO 2018 (25 February 2018)

March 1, 2018

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

**Q.1 9.8 ? 10.6 7.4 13.8 1**

(A) 12

(B) 6.5

(C) 3

(D) 9

(E) None of these

**Q.2 609 204 69 24 ? 4**

(A) 9

(B) 12

(C) 18

(D) 15

(E) 10

**Q.3 500 498 489 461 ? 270**

(A) 269

(B) 356

(C) 396

(D) 325

(E) 215

**Q.4 1 3 21 71 169 ?**

(A) 335

(B) 306

(C) 295

(D) 249

(E) None of these

**Q.5 8 5 6 10 21 ?**

(A) 35

(B) 53.5

(C) 29.6

(D) 45.5

(E) None of these

**Answer 1. (D) 9**

**Explanation:**

Pattern |
Series |

9.8 | 9.8 |

9.8 − .8 | 9 (✓) |

9 + 1.6 | 10.6 |

10.6 − 3.2 | 7.4 |

7.4 + 6.4 | 13.8 |

13.8 − 12.8 | 1 |

**Answer 2. (A) 9**

**Explanation:**

Pattern |
Series |

609 | 609 |

609 ÷ 3 + 1 | 204 |

204 ÷ 3 + 1 | 69 |

69 ÷ 3 + 1 | 24 |

24 ÷ 3 + 1 | 9 (✓) |

9 ÷ 3 + 1 | 4 |

**Answer 3. (C) 396**

**Explanation:**

Pattern |
Series |

500 | 500 |

500 − (1^{3} + 1) |
498 |

498 − (2^{3} + 1) |
489 |

489 − (3^{3} + 1) |
461 |

461 − (4^{3} + 1) |
396 (✓) |

396 − (5^{3} + 1) |
270 |

**Answer 4. (E) None of these**

**Explanation:**

Series |
: |
1 | 3 | 21 | 71 | 169 | 331 |
|||||

Pattern |
: |
2 | 18 | 50 | 98 | 162 | ||||||

+16 | +32 | +48 | +64 |

**Answer 5. (B) 53.5**

**Explanation:**

Pattern |
Series |

8 | 8 |

8 × 0.5 + 1 | 5 |

5 × 1 + 1 | 6 |

6 × 1.5 + 1 | 10 |

10 × 2 + 1 | 21 |

21 × 2.5 + 1 | 53.5 (✓) |