7) B
nth term = n
n + 1
So, (n + 1)th term:
n + 1
n + 1 + 1
n + 1
n + 2
Difference between (n + 1)th term and nth term:
n + 1 – n
n +2 n + 1
n + 1 (n + 1) – n (n +2)
(n + 2) (n + 1)
n² + 2n + 1 – n² – 2n
(n + 2) (n + 1)
1
(n + 2) (n + 1)