" If "nC_(r-1)=36,nC_(r)=84" and "nC_(r+1)=126," then "n=

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If nC_(r-1)=36,nC_(r)=84 and nC_(r+1)=126 then (a) n=8,r=4( b) n=9,r=3(c)n=7,r=5(d) non of these

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