Choose the correct alternative for the missing term in the series: $deb, ijg, nol, ?, xyv$.

Fill in the blank space for the given series with the correct alternative.
$165, 195, 255, 285, 345, (\ldots)$

Which number will come next in the following series?
$2, 1, 2, 1, 3, 2, 1, 3, 4, 2, 1, 3, 4, 5, 2, 1, 3, 4, 5, 6, 2, 1, 3, 4, 5, ?$

Complete the given series by selecting the correct alternative: $2, 6, 12, 20, 30, ?$

Choose the correct alternative for the missing term.
$?, siy, oeu, kaq, gwm, cri$

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

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

Four of the following five are alike in a certain way based on the positions of the elements in the arrangement and hence form a group. Which one does not belong to the group?