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.
$121, 225, 361, (\ldots)$

Choose the correct alternative to complete the series: $...bca...cca...ca....b...c$

Study the following arrangement carefully and answer the question given below:
$7, R, E, T, 4, A, 9, \%, D, F, 1, U, \#, B, @, 8, H, I, W, M, \star, 3, 2, V, \,5,N,P,6,Q$
How many such numbers are there in the above arrangement,each of which is immediately preceded by a letter but not immediately followed by a symbol?

Choose the correct alternative to fill in the blanks in the series: $abca....bcaab....ca....bbc...a$

Choose the correct alternative for the missing term in the series: $BF, CH, ?, HO, LT$.