Fill in the blank space for the given series with the correct alternative.
$2, 5, 11, 23, 47, (\ldots)$

Find out the wrong term from the given series.
$52, 51, 48, 43, 34, 27, 16$

Which term will replace the question mark in the series:
$ABD, DGK, HMS, MTB, SBL, ?$

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

Fill in the blank space for the given series with the correct alternative.
$(2,3), (3,5), (5,7), (7,11), (11,13), (\ldots)$

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