Fill in the blank space for the given series with the correct alternative.
$11, 12, 17, 18, 23, 24, (\ldots)$

Choose the correct alternative to fill in the blanks for the series: $cab....a....c....be....be....b....ab$

Find the missing letters for the given series from the given alternatives:
$.....bca......cca....ca.....b.....c$

If the digits in the number $5, 7, 3, 4, 6, 2, 9$ are arranged in ascending order from left to right,how many digits will remain at the same position?

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 consonants are there in the given arrangement,each of which is immediately followed by a number but not immediately preceded by a vowel?

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