Fill in the blank space for the given series with the correct alternative.
$0.5, 0.55, 0.65, 0.8, (...)$

Which number would replace the question mark in the series $7, 12, 19, ?, 39$.

To answer these questions, study the following arrangement of digits, letters and symbols carefully.

$6, N,P ,=,@, 7,1 ,\&, R, T, 3, L, ,B, \star, E ,4,\# ,8, G,H ,\$, 5, K,M ,?, 2, D,C$

If all the digits in the arrangement are deleted, which of the following will be midway between the $3^{rd}$ and the $15^{th}$ elements from the left end?

How many such $4$s are there in the following number series,each of which is immediately followed by $5$ but not immediately preceded by $3$?
$5, 4, 4, 3, 3, 4, 5, 4, 5, 5, 3, 4, 4, 3, 4, 5, 4, 3, 3, 5, 4, 5, 4, 3, 5, 4, 4, 3, 5, 4$

Choose the correct alternative to complete the series: $....op....mo.....n....\,...pnmop.....$

Find out the wrong term from the given series:
$3, 4, 10, 32, 136, 685, 4116$