Question

what formula is needed to get the sequence of 20, 40, 60, 80, 100

Answer 1

I think get average
20+40+60+80+10÷5=60 I think correct

Answer 2

This is an AP (Arithmetic progression)

you can see the difference between each term is constant = 20
this difference is called common difference and denoted by d

a is known as the first term
there fore
a= 20
d= 40-20 = 60-40= 80-60=100-80= 20

let any nth term be represented by p

by ap formula
p= a+(n-1)d
this is the formula


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