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

Study the following arrangement carefully and answer the question given below:
$B, 2, I, J, K, 4, 3, H, 5, E, R, P, 6, N, A, 9, W, 8, T, U, 1, V, D, 7, F$
How many such numbers are there in the above arrangement,each of which is immediately preceded by a vowel and immediately followed by a consonant?

The following questions are based on the five three-digit numbers given below:
$972, 526, 487, 359, 251$
If $2$ is added to the sum of the digits of each of the above numbers,how many will be multiples of $5$?

Choose the correct alternative for the missing term in the series: $eac, gee, ieg, ?$

Fill in the blank space for the given series with the correct alternative.
$1, 2, 3, 6, 9, 18, (\ldots), 54$

Choose the correct alternative for the missing term:
$BEH, KNQ, TWZ, ?$