Find the missing letters for the given series from the given alternatives.
$a....cdaab....cc....daa....bbb......ccddd$

Following questions are based on the five three-digit numbers given.
$513, 248, 371, 634, 167$
Which of the following is the last digit of the middle number when they are arranged in ascending order?

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

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?

How many such digits are there in the number $8,3,1,6,5$ each of which is as far away from the beginning of the number as when the digits are rearranged in ascending order within the number?

Find out the missing letters for the given series from the given alternatives.
$....aba.....cabc....dcba......bab.....a$