If `.^(n)C_(r )=84, .^(n)C_(r-1)=36 " and" .^(n)C_(r+1)=126`, then find the value of n.

If ^nC_r=84 ,^n C_(r-1)=36 ,a n d^n C_(r+1)=126 , then find the value of ndot

If ""^(n)C_(r -1) = 36, ""^(n)C_(r) = 84 " and " ""^(n)C_(r +1) = 126 , then find the value of ""^(r)C_(2) .

If ""^n C_(r-1) = 36, ""^(n) C_(r) = 84 and ""^(n) C_(r+1) = 126 then find the value of r.

If .^(n)P_(r) = 720 and .^(n)C_(r) = 120 , then find r. .

If .^(n)C_(r-1)=36, .^(n)C_(r)=84 and .^(n)C_(r+1)=126 , find n and r.

If ^n C_r=84 , and ^n C_(r-1)=36 , and r = 1 , then find the value of ndot

If .^(n+1)C_(r+1.): ^nC_r: ^(n-1)C_(r-1)=11:6:3 find the values of n and r.

If .^(n)C_(r-1): .^(n)C_(r): .^(n)C_(r+1)=3:4:5 , find the values of n and r.

If .^(n+1)C_(r+1):^(n)C_(r):^(n-1)C_(r-1)=11:6:3 , find the values of n and r.

If ""^(n)C_r : ""^(n)C_(r+1) =1 : 2 and^(n)C_(r+1): ""^(n)C_(r+2) = 2 : 3 determine the values of n and r.