Fill in the blank space for the given series with the correct alternative.
$34, 18, 10, 6, 4, (...)$

Fill in the blank space for the given series with the correct alternative.
$95, 115.5, 138, (...), 189$ (in $.5$)

Study the following arrangement carefully and answer the questions given below:
$R, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, D, 9, U, 2, Y, V$
If all the numbers in the above arrangement are dropped,which of the following will be the ninth to the left of $D$?

The positions of the first and the second digits in the number $7986032451$ are interchanged. Similarly,the positions of the third and fourth digits are interchanged,and so on. Which of the following will be the fifth digit from the right end after the rearrangement?

Choose the correct alternative to fill in the blanks in the series: $ab...bbc...c...ab...ab...b$

Fill in the blank space for the given series with the correct alternative.
$11, 13, 17, 19, 23, 25, (\ldots)$