Choose the correct alternative for the missing term in the series: $AYD, BVF, DRH, ?, KGL$

Study carefully the following arrangement of letters, digits and symbols to answer these

questions.

$M, 7 ,\&, 8, L ,P ,@ ,Q ,N ,\beta ,T ,Y ,3 ,2 ,= ,E ,\$ ,4 ,9 ,\#, G ,H ,5$

How many such symbols are there in the arrangement each of which is immediately preceded by a number?

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

Choose the correct alternative to complete the series: $...acca....ccca...acccc....aaa$

Choose the correct alternative for the missing term:
$MHZ, NIW, OKT, PNQ, ?$

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?