The number of arrangements of 2n+2 different objects taken n at a time is to the number of arrangments of 2n different objects taken n at a time as 14:5. Find the value of n.

If 2nPn = 8.(2n-1)P(n-1), find the value of n

the P refers to the formula in permutations and combinations that is nPr = n!/(n-r)!

i dont understand how to solve these questions. some help is greatly appreciated. thankyou =D