What should come next in the following letter series?
$nsi, org, pqe, qpc, ?$

One term in the number series is wrong. Find it.
$0, 3, 8, 15, 24, 33$

Second and third digits of each number given below are interchanged. Then,the $1st$ and the last digits of each new number thus formed are interchanged. Which of the following numbers then will be the highest number among the five?
$273, 372, 438, 184, 526$

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

These questions are based on the following letter/number/symbol arrangement. Study it carefully and answer the questions that follow.

$5, D,H,E, \star, 7,9, \$ ,F,I ,6 ,R ,\% ,L ,1 ,A,J, 3, B, \# ,4 ,@ ,K,P ,8, U,M ,2$

If all the symbols are removed from the above arrangement, which element will be third to the left of thirteenth from the left?

Find out the wrong term from the given series.
$125, 126, 124, 127, 123, 129$