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5 P, 7R, 11V, 13 X, ________

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17 B

19 P

15 M

19 L

answer is A.

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Detailed Solution

$5 \overset{+ 2}{\to} 7 \overset{+ 4}{\to} 11 \overset{+ 2}{\to} 13 \overset{+ 4}{\to} (17)$

$P \overset{+ 2}{\to} R \overset{+ 4}{\to} V \overset{+ 2}{\to} X \overset{+ 4}{\to} (B)$

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