How many terms are there in the series $201, 208, 215, \dots, 369$?

Fill in the blank space for the given series with the correct alternative.
$2, 6, 12, 20, 30, 42, 56, (\ldots)$

Find out the wrong term from the given series.
$89, 78, 86, 80, 85, 82, 83$

Find the missing term for the given series from the given alternatives:
$C, B, A, E, D, Z, G, F, (?)$

Find out the wrong term from the given series: $8, 27, 125, 343, 1331$.

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?