Question

In an A.P if the first term (a) and common differences (d) are given then Sn=​

Answer 1

Answer:

a+ (n-1)d

hope it helps ❤

Answer 2

Step-by-step explanation:

Correct option is

A

a=

2

d

Given, first term =a, common difference =d

By using S

n

=

2

n

[2a+(n−1)d] we have,

∴

Sx

Skx

=

2

x

(2a+(x+1)d)

2

kx

(2a+(kx−1)d)

⇒

Sx

Skx

=

(2a+(x+1)d)

k(2a+(kx−1)d)

⇒

Sx

Skx

=

2a+xd−d

k(2a−d+kxd)

Now this will be independent of x only when 2a=d or a=

2

d