Question

What is the sum of the n term of an arithmetic sequence 1,3,5,7

Answer 1

Step-by-step explanation:

a=1

d=2

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

sn= (n/2)(2*1+(n-1)2)

sn= (n/2)(2+2n-2)

sn= (n/2)(2n)

sn= n^2