Fill in the blank space for the given series with the correct alternative.
$1, 2, 6, 24, (...)$

Choose the correct alternative to fill in the blanks in the series: $....\,,\;....aba....\,,\;....ba.....ab$

Find the missing term for the given series from the given alternatives:
$C, B, A, E, D, Z, G, F, (?)$

Choose the correct alternative for the missing terms in the series: $b, e, d, f, ?, h, j, ?, l$

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

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?