What terms will fill the blank spaces?
$Z, X, V, T, R, (...), (...)$

If $2$ is subtracted from each odd digit and $3$ is added to each even digit in the number $3675249$,how many digits will appear twice in the new number thus formed?

Fill in the blank space for the given series with the correct alternative.
$66, 36, 18, (\ldots)$

Find the missing term for the given series from the given alternatives:
$DEB, IJG, NOL, ?, XYV$

Find out the missing letters for the given series from the given alternatives:
$abca . . . . . bcaab . . . . . ca . . . . . bbc . . . . . a$

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?