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

7. | 1, 2, 3, 6, 9, 18, ?, 54 | |||||||

The pattern is x 2, x 3/2, x 2, x 3/2, x 2,….. So, missing term = 18 x 3/2 = 27. |

8. | 6, 13, 25, 51, 101, ? | |||||||

The pattern is x 2 + 1, x 2 – 1, x 2 + 1, x 2 – 1,….. So, missing term = 101 x 2 + 1 = 203. |

9. | 5,6,9, 15, ?, 40 | |||||||

The pattern is + 1, + 3, + 6,….., i.e. + 1, + (1, + 2), + (1 + 2 + 3),….. So, missing term = 15 + (1 + 2 + 3 + 4) = 25. |

10. | 1, 3, 4, 8, 15, 27, ? | |||||||

The sum of any three consecutive terms of the series gives the next term. So, missing number = 8 + 15 + 27 = 50. |