Which term will replace the question mark in the series:
$ABD, DGK, HMS, MTB, SBL, ?$

Choose the correct alternative to complete the series: $aab....aa....bbb....aaa....bbba$

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?

Choose the correct alternative for the missing term in the series: $? , ayw, gee, mki, sqo$

Choose the correct alternative to complete the series: $a . b e . . c . . a b b . . . b c a . . . .$

Fill in the blank space for the given series with the correct alternative.
$3, 10, 20, 33, 49, 68, (\ldots)$