Question

please answer fast....​

Answer 1

Answer:

Step-by-step explanation:

d =a2-a1=-3+1/n,a= 4-1/n l,n=n

an = a+ (n-1) d

= 4-1/ n (n-1) -3+1/n

=Taking LCM

= 4n-1 -3n+3+n-1/n

= 2n+1/n

Plzzz mark brainleist

Answer 2

Answer:

4n + 3n^2 - 1 / 2

Step-by-step explanation:

a1 = 4 - 1/n, a2 = 7 - 2/n

so d = 3 - 1/n

Sn = n/2 ( 2a + (n - 1) d)

Sn = 4n + 3n^2 -1 /2