What will come in place of the question mark $(?)$ in the following alphabet series?
$CD, FG, JK, ?, UV$

Fill in the blank space for the given series with the correct alternative.
$8, 24, 12, 36, 18, 54, (\ldots)$

Find out the wrong term from the given series.
$1, 2, 6, 15, 31, 56, 91$

Choose the correct alternative for the missing term:
$A, CD, GHI, ?, UVWXY$

These questions are based on the following arrangement. Study it carefully and answer the questions.

$J ,\star, R, 3, P,L ,2 ,\# ,I,N, 7, O,C, @ ,K, 5, D, =, M, \$, 6, B, > ,A ,Q ,4$

Four of the following five are alike in a certain way based on the positions of the elements in the arrangement and hence form a group. Which one does not belong to the group?

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