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?

Study of the following arrangement carefully and answer the questions given below.

$Q,E ,* ,P,M ,8 ,R,A ,@ ,C ,9 ,U,H,W, \# ,J,Z, ,S, \beta, Y,N ,5 ,\$ ,G,I,T$

What should come in place of the question mark $(?)$ in the following series based on the above arrangement?

$QP@,MAH,@YZ,?$

Choose the correct alternative to fill in the blanks in the series: $abca....bcaab....ca....bbc...a$

Find the wrong number in the series:
$7, 28, 63, 124, 215, 342, 611$

What will come in place of the question mark $(?)$ in the following alphabet series?
$XDH, \quad VGJ, \quad TJL, \quad RMN, \quad ?$

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?