Question

HELP PLEASE ASAP MEDAL!!!
A playground is being designed where children can interact with their friends in certain combinations.

If there is 1 child, there can be 0 interactions.
If there are 2 children, there can be only 1 interaction.
If there are 3 children, there can be 5 interactions.
If there are 4 children there can be 14 interactions.

Which recursive equation represents the pattern?

A. an=an-1+2^(n-1)
B. an=an-1+(n-1)^2 <- my answer
C. an=an-1+2(n-1)
D. an=an-1+(2n-1)

Answer 1

@Astrophysics

Answer 2

@mathmale

Answer 3

@iGreen

Answer 4

https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.777509.html see if this will help