18 21 25 18 29 33 18
What numbers should come next

2, 10, 40, 120,____

Which number would replace underline mark in the series?
1, 20, 58, ____, 191.

Which number would replace underline mark in the series?
1, 6, 26,_____, 426.

Which number would replace underline mark in the series

2, 5, 10, 17, ---, 37

Which of the following is exactly in the middle between the tenth from the left and the eighth from the right end