Question

plzz answer this question fast

Answer 1

2(nP2) + 50 = 2n P 2
2*n*(n-1) + 50 = 2n *( 2n -1 )
2n² - 2n + 50 = 4n² - 2n
0= 4n² - 2n² - 2n + 2n - 50
0= 2n² - 50
50 = 2n²
50/2= n²
25 = n²
n = √25
n = ±5
but n cannot be negative because factorial can be solved only for positive integers
so n = 5 answer