Find the missing letters for the given series from the given alternatives.
$b....b...bb....,.....bbb.....bb....b$

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?

The following questions are based on the five three-digit numbers given below:
$972, 526, 487, 359, 251$
If $1$ is subtracted from the last digit of each of the above numbers,the sum of the digits of how many of them are prime numbers?

Study of the following arrangement carefully and answer the questions given below.

$Q,E ,* ,P,M ,8 ,R,A ,@ ,C ,9 ,U,H,W, \# ,J,Z, ,S, \beta, Y,N ,5 ,\$ ,G,I,T$

Which of the following is eighth to the right of the thirteenth element from the left end of the arrangement?

Find out the wrong term from the given series.
$25, 36, 49, 81, 121, 169, 225$

Find the missing term for the given series from the given alternatives.
$G, H, J, M, (?), V$