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If n is an odd natural number and ""^...

If n is an odd natural number and
`""^(n)C_(0)lt ""^(n)C_(1)lt ""^(n)C_(2)lt ...lt ""^(n)C_(r) gt ""^(n)C_(r+1) gt ""^(n)C_(r+2) gt ...gt""^(n)C_(n)`,
then r=

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