If `10. ""^(n)C_(2)=3. ""^(n+1)C_(3)` find n.

(i) If ""^(2n)C_(3) : ""^(n)C_(3)= 11 : 1 , find n. (ii) If ""^(2n)C_(3) : ""^(n)C_(2) = 12 : 1 , find n.

The value of (""^(n) C_(1)+2. ""^(n) C_(2)+3. ""^(n)C_(3)+…+ n""^(n)C_(n)) is-

If .^(2n)C_(3):.^(n)C_(3)=12:1 , find n.

Find 'n', if ""^(2n)C_(1), ""^(2n)C_(2) and ""^(2n)C_(3) are in A.P.

If ""^(2n)C_(1), ""^(2n)C_(2) and ""^(2n)C_(3) are in A.P., find n.

Find n, if ""^(2n)C_(1),""^(2n)C_(2) and ""^(2n)C_(3) are in A.P.

If .^(n)C_(3)=.^(n)C_(2) , then find .^(n)C_(2) .

If .^(n)C_(4)=.^(n)C_(2) , then find .^(n)C_(3) .

If ""^(2n)C_(3) : ""^(n) C_(3)= 11 : 1 then n is