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

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

Study the following arrangement carefully and answer the question given below.
$Q, E, *, P, M, 8, R, A, @, C, 9, U, H, W, \#, J, Z, S, \beta, Y, N, 5, \,G,I,T$
How many such vowels are there in the above arrangement,each of which is immediately followed by a symbol?

Choose the correct alternative to fill in the blanks in the series: $abb . . . . baa . . . . a . . . bab . . . . aba$

To answer these questions, study the following arrangement of digits, letters and symbols carefully.

$6, N,P ,=,@, 7,1 ,\& , R, T, 3, L, ,B, \star, E ,4,\# , 8, G,H ,\$, 5, K,M ,?, 2, D,C$

If all the symbols in the arrangement are deleted, which of the following will be the $4^{th}$ to the left of the $12^{th}$ element from the left end?

Find out the wrong term from the given series.
$2, 5, 10, 17, 26, 37, 50, 64$