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If "^16C5 + "^16C6 + "^17C7 + "^18C8 = "...

If `"^16C_5` + `"^16C_6` + `"^17C_7` + `"^18C_8` = `"^19C_x`, then` x = `

A

A.19

B

B.8

C

C.18

D

D.7

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