Select the letter from among the given options that can replace the question mark (?) in the following series.
D, F, I, ?, R, X
According to question D, F, I, ?, R, X there is a 1,2,3 etc gap continue in given series D-F 1 alphabet gap, then F-I 2 alphabet gap like that it will continue so after I it will be M with 4 alphabet gap.
Hence option B is a correct answer
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