Which letter should replace A, D, G, J, M, ?

In the series of letters given below, which option will come in the place of question mark (?)? BXF, DVI, FTL, HRO, ?

Choose the group of letters which is different from others.

If the letters of the word “PRODUCT” are arranged alphabetically, then which letter would be last letter of word?

In English alphabet, which is the 17th letter from your left?

The next term of the following letter series will be : CAE, HFJ, MKO, RPT, ….