In RS ∶ 18/19 → Values of R and S are 18 and 19 respectively in the English alphabet and the next term is obtained by; 18/19 Similarly, In ?∶ 25/7 → Values of Y and G are 25 and 7 respectively in the English alphabet and the next term is obtained by; 25/7 Hence, ‘YG’ is the correct answer.