Question
If 56Pr+6:54Pr+3 = 30800:1, then r =
Answer: Option B
:
B
56!(50−r)!×(51−r)!54!
= 308001⇒56×55×(51−r) = 30800⇒r = 41
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:
B
56!(50−r)!×(51−r)!54!
= 308001⇒56×55×(51−r) = 30800⇒r = 41
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