Subject :IMO Class : Class 10
How many symbol and numbers are there in the sequence which are either immediately preceded or immediately followed by the letter which is from the first half of the English alphabet?
2 P J @ 8 $ L B I V # Q 6 δ G W 9 K C D 3 © • £ 5 F R 7 A Y 4
A 6
B 7
C 8
D 9