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If ""^(56)P(r+6)" : ""^(54)P(r+3) = 3080...

If `""^(56)P_(r+6)" : ""^(54)P_(r+3) = 30800 :1`, then the value of r is

A

69

B

41

C

51

D

61

Text Solution

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The correct Answer is:
B
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