If ""^(56)P(r+6) : ""^(54)P(r+3)= 30800...

If ` ""^(56)P_(r+6) : ""^(54)P_(r+3)= 30800, ` then r is

A

40

B

51

C

101

D

410

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ICSE-PERMUTATIONS AND COMBINATIONS-MULTIPLE CHOICE QUESTIONS

If ""^(56)P(r+6) : ""^(54)P(r+3)= 30800, then r is
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