Choose the correct alternative for the missing term:
$AB, BA, ABC, CBA, ABCD, ?$

Choose the correct alternative to complete the series: $....op....mo.....n....\,...pnmop.....$

The following question is based on the five three-digit numbers given below:
$519, 368, 437, 246, 175$
Which of the following is the sum of the middle digits of the highest and the lowest 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 exactly in the middle between the twelfth from the right and the seventh from the left end?

Find out the wrong term from the given series.
$196, 169, 144, 121, 80$

Choose the correct alternative to complete the series: $b . . b . . b b . . . b b b . . . . b b . . b$