In a row Rama is twelth from the left end. Reena is 19th from the right end. After their places are interchanged. Rama their places are interchanged. Rama becomes 21st from the left end. How many students are there in the row?
A. 52
B. 40
C. 39
D. Data inadequate
A. 52
B. 40
C. 39
D. Data inadequate
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