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" If "sum(r=0)^(23){=0,c(r)=0+C(2z-)}=K(...

" If "sum_(r=0)^(23){=0,c_(r)=0+C_(2z-)}=K(^(" sa ")C_(25))," then "K" is equal to "

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If sum_(r=0)^25 {.^50C_r*^(50-r)C_(25-r)}=K(.^50C_25), then K is equal to

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If Sigma_(r=0)^(25) (""^(50)C_(r)""^(50-r)C_(25-r))=K(""^(50)C_(25)) , then K is equal to

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The valur of sum_(r=0)^(n) sum_(p=0)^(r) ""^(n)C_(r) . ""^(r)C_(p) is equal to