Question

2n+1,4n-1,5n+1...are in arithmetic sequence.find x.

Answer 1

4n-1-(2n+1) = 5n+1-(4n-1)

4n-1-2n-1 = 5n+1-4n+1

2n -2 = n+2

2n-n = 2+2

n = 4