RRB Group-D Model Paper 17 with answers for online practice

Logic: In the options the adding the number and place value of letter is 20.
1) P4 → 16 + 4 = 20
2) S2 → 19 + 2 = 21
3) O5 → 15 + 5 = 20
4) I11 → 09 + 11 = 20.
Hence, S2 is the odd one out.