Choose the correct alternative to fill in the blanks in the series: $....cb...ca....bacb....ca.....bac...d$

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

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

If the first element in the above arrangement exchanges its position with the element in the $26 th$ position and the second with the one in the $25 th$ position and so on, which of the following will be in the tenth position from the left after rearrangement?

Choose the correct alternative to complete the series: $b _ a c _ c c _ c b _ a b _ a c$

Fill in the blank space for the given series with the correct alternative.
$2, 6, 12, 20, 30, 42, 56, (\ldots)$

Choose the correct alternative to complete the series: $c _ b b b _ a b b b b _ a b b b b _ a b$

Find the missing term for the given series from the given alternatives:
$CX, FU, IR, ?, OL, RI$