Fill in the blank space for the given series with the correct alternative.
$9, 12, 11, 14, 13, (\ldots), 15$

What should come next in the following letter series?
$bac, bacd, bacde, bacdef, bacd?$

These questions are based on the following arrangement. Study it carefully and answer the questions.

$8 ,H ,\% ,3,7 ,T,A ,4 ,\# ,6 ,B,I ,@ ,R ,1 ,Q ,\star, L,E ,2 ,K ,\$ ,U ,5,9$

If all the symbols are dropped from the above arrangement, which element will be ninth from the left end ?

The following questions are based on the five three-digit numbers given below:
$972, 526, 487, 359, 251$
If $1$ is subtracted from the last digit of each of the above numbers,the sum of the digits of how many of them are prime numbers?

Choose the correct alternative for the missing term in the series: $3F, 6G, 11I, 18L, ?$

The following question is based on the five three-digit numbers given:
$513, 248, 371, 634, 167$
Which of the following represents the sum of all three digits of the lowest number among them?