Choose the correct alternative to complete the series: $...bcdbc...dcabd....bcdbc....dc....bd$

Choose the correct alternative for the missing term:
$A, C, F, H, ?, M$

Find the missing letters for the given series from the given alternatives.
$ccbab....caa.....bccc.....a.....$

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?

The following questions are based on the five three-digit numbers given below:
$972, 526, 487, 359, 251$
If the digits in each of the above numbers are written in reverse order,which will be the second highest number?

Choose the correct alternative to fill in the blanks in the series: $....bbca....bcca......ac.....a...cb$