Choose the correct alternative to complete the series: $aa...aaa.....aaaa...aaaa...b$

Choose the correct alternative to complete the series: $a...abbb...cccd....ddccc....bb...ba$

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

These questions are based on the following arrangement. Study it carefully and answer the questions.

$J ,\star, R, 3, P,L ,2 ,\# ,I,N, 7, O,C, @ ,K, 5, D, =, M, \$, 6, B, > ,A ,Q ,4$

How many such symbols are there in the above arrangement each of which is immediately followed by a consonant and immediately preceded by a number?

Choose the correct alternative for the missing term in the series: $BF, CH, ?, HO, LT$.

Fill in the blank space for the given series with the correct alternative.
$11, 10, (...), 100, 1001, 1000, 10001$