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

How many such consonants are there in the above arrangement, each of which is immediately preceded by a symbol and immediately followed by a number