Fill in the blank space for the given series with the correct alternative.
$2, 3, 8, 63, (\ldots)$

Study carefully the following arrangement of letters,digits,and symbols to answer the question:
$M, 7, \&, 8, L, P, @, Q, N, \beta, T, Y, 3, 2, =, E, 4, 9, \#, G, H, 5$
How many such letters are there in the arrangement,each of which is immediately followed by a number?

Find out the wrong term from the given series.
$1, 2, 6, 15, 31, 56, 91$

Find out the missing term for the given series from the given alternatives:
$OTE, PUF, QVG, RWH, ?$

Find the missing letters for the given series from the given alternatives:
$.....abb......\,,....bb....a.....bbab.....ba$

Choose the correct alternative to complete the series: $...bcdbc...dcabd....bcdbc....dc....bd$