" 11.यदि "^(n)P(r)=^(n)P(r+1)" तथा "^(n)...

" 11.यदि "^(n)P_(r)=^(n)P_(r+1)" तथा "^(n)C_(r)=^(n)C_(r-1)," तो "n" और "r" के काब ज्ञात कटो। "

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