Answers

2016-07-16T19:55:34+08:00
Apply this formula..

an= a1 + (n-1)d

an= 401
a1= 5
d= 4 (common difference between terms) a2-a1=d 

Solve for n

401=5 + (n-1) 4  [ Subtract 5 from both sides ]
396= (n-1)4 [ Divide by 4 in both sides ]
99 = n-1 [ Add 1 in both sides of the equation ]
n=100

401 is the 
 x^{100}  term
2 5 2