How many 'M's are immediately preceded and followed by 'N' in the following series?
M N N M N N M M M N N N O O M M M M N N M M M T T M N M N M N M N
1
3
2
5
3
7
4
4
How many 'M's are immediately preceded and followed by 'N' in the following series?
M N N M N N M M M N N N O O M M M M N N M M M T T M N M N M N M N