### Exercise :: Series Completion - Section 1

- Series Completion - Section 1
- Series Completion - Section 2
- Series Completion - Section 3
- Series Completion - Section 4
- Series Completion - Section 5

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

31. | 66, 36, 18, ? |
|||||||

Answer: Option C Explanation: Each term in the series is the product of the digits of the preceding term. So, missing term = 1 x 8 = 8. |

32. | In the series 3, 9, 15, ...... what will be the 21st term? |
|||||||

Answer: Option C Explanation: Clearly, 3 + 6 = 9, 9 + 6 = 15,..... So, the series is an A.P. in which a = 3 and d = 6. Therefore 21st term = a + (21 - 1) d = a + 20d = 3 + 20 x 6 = 123. |

33. | 28, 33, 31, 36, ?, 39 |
|||||||

Answer: Option B Explanation: The pattern is + 5, - 2, + 5, - 2,..... So, missing term = 36 - 2 = 34. |

34. | 1, 9, 25, 49, 81, ? |
|||||||

Answer: Option C Explanation: The series consists of squares of consecutive odd numbers i.e. 1 So, missing term = 11 |

35. | 1, 9, 25, 49, ?, 121 |
|||||||

Answer: Option B Explanation: The given series consists of squares of consecutive odd numbers i.e. 1 So, missing term = 9 |