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""^(n) C(r-1) = 330 ,""^(n)C(r)=462 , ...

`""^(n) C_(r-1) = 330 ,""^(n)C_(r)=462 , ""^(n)C_(r+1) = 462 implies r=`

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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-PRACTICE EXERCISE
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  2. If ""^(n)C(r-1):""^(n)C(r):""^(n)C(r+1)=2:4:5 then (n,r) is

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  3. ""^(n) C(r-1) = 330 ,""^(n)C(r)=462 , ""^(n)C(r+1) = 462 implies r=

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