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"^14C5 + "^14C6+"^15C7+"^16C8 = "^17Cr, ...

`"^14C_5` + `"^14C_6`+`"^15C_7`+`"^16C_8` = `"^17C_r`, then `r`=

A

A.17

B

B.16

C

C.8

D

D.10

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