Question

Compose an expression to find the 20th term of any arithmetic sequence in terms of just a and d. Look at the pattern in

part A with the first three terms to help you.
20th term:

Answer 1

Hello,

Explanation:

u(i) is the ith term of the a.s

a is the first term and d the common difference

for n in {1,2,3...}: u(n)=a+(n-1)*d

u(1)=a+0*d=a

u(2)=u(1)+d=a+d=a+1*d

u(3)=u(2)+d=a+1*d+d=a+2*d

...

u(20)=a+19*d

Answer 2

a+19d

Explanation:

edmentum