Which letter will replace the question mark (?) in the following series?
X, R, ?, I, F, D, C
As per the given pattern in the question,
X, R, ?, I, F, D, C
$$X \ \underrightarrow{+6} \ R \ \underrightarrow{+5} \ M \ \underrightarrow{+4} Â \ I \ \underrightarrow{+3} \ F \ \underrightarrow{+2} \ D \ \underrightarrow{+1} \ C$$
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