Find the odd one out in the series: A, D, G, J, M, P, ?
Answer: B. S
The series consists of letters that are increasing by three positions in the alphabet (A+3=D, D+3=G, G+3=J, J+3=M, M+3=P). The next letter should be S (P+3), making S the odd one out as it does not follow the pattern of the previous letters.