Choose the correct alternative to fill in the blanks in the series: $....bbca....bcca......ac.....a...cb$

Find out the wrong term from the given series.
$11, 5, 20, 12, 40, 26, 74, 54$

In the number $76534218$,each digit is replaced by the next digit (i.e.,$1$ is replaced by $2$,$2$ is replaced by $3$,and so on). After this,the digits are arranged in ascending order from left to right. Which digit will be fifth from the left end?

Fill in the blank space for the given series with the correct alternative.
$2, 1, 2, 4, 4, 5, 6, 7, 8, 8, 10, 11, (\ldots)$

To answer these questions,study carefully the following arrangement of letters,digits,and symbols:
$6, =, *, C, E, 3, 8, G, L, M, 7, \star, @, P, R, 4, !, N, T, 5, S, V$
How many such letters are there in the arrangement,each of which is immediately followed by a symbol?

Which of the letters will come next in the following series?
$a, ab, abc, abcd, abcde, abcde, ?$