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Find r if 5Pr=6Pr-1
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asked
Feb 2, 2019
in
Mathematics
by
kratos
Find r if 5Pr=6Pr-1
combinatorics
class-11
permutations and combinations
mathematical induction
class-12
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answered
Sep 22, 2020
by
kratos
Best answer
It is known that,
≤ r ≤ 5
Hence, r ≠ 9
r = 4
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