Find out the wrong term from the given series.
$8, 13, 21, 32, 47, 63, 83$

Choose the correct alternative to fill in the blanks in the series: $ab...bcbca...c...bab$

The following question is based on the five three-digit numbers given:
$513, 248, 371, 634, 167$
Which of the following is the middle digit of the second highest number among these numbers?

Find out the wrong term from the given series.
$1, 3, 10, 21, 64, 129, 256, 778$

To answer these questions, study the following arrangement of digits, letters and symbols carefully.

$6, N,P ,=,@, 7,1 ,\&, R, T, 3, L, ,B, \star, E ,4,\# , 8, G,H ,\$, 5, K,M ,?, 2, D,C$

How many such digits are there in the arrangement each of which is immediately followed by a symbol but not immediately preceded by a letter?

Fill in the blank space for the given series with the correct alternative.
$2, 3, 5, 7, 11, (\ldots), 17$