Alpha-Numeric, ...

The positions of how many digits in the number will remain same after the digits within the number 2138574 are arranged in ascending order? (SOF IMO 2016)

How many such consonants are there in the given arrangement, each of which is immediately preceded by a number but not immediately followed by a number? (SOF IMO 2016) F 4 ©J 2 E % M P 5 W 9 @ I Q R 6 U H 3 Z 7 * A T B 8 V # G $ Y D

How many consonants are there in the given sequence which are immediately followed by a digit and immediately preceded by a symbol? (SOF NCO 2017) M N @ 1 T 2 # R U 3 © P Z K * 7 B A 6 £ G V 9 W 0 Y Z

If all the symbols are dropped from the given arrangement, then which of the following will be the twelfth element to the left of E?  (SOF IMO 2017) 

× 2 @ l v l 1 N # R U 5 Y 8 © J L T 3 H K 7 S $ B W 4 E % H * D F

If first four letters of the English alphabet are written in reverse order; again next 5 letters are written in reverse order; again next 6 letters are written in reverse order; again next 7 letters are written in reverse order and finally, the remaining letters are also written in reverse order, then what will be the 9th letter to the right of the 7th letter from left end?    (SOF IMO 2017)