Answer:
none
Step-by-step explanation:
becàuse it has thesame masses
6
Substitute n for 3
A(n) = 3/2(-2)^(n-1)
A(3) = 3/2(-2)^(3-1)
A(3) = 3/2(-2)²
A(3) = 3/2(4)
A(3) = 12/2
A(3) = 6
It is 51.
5x6=30
3x7=21
30+21=51
Hope that I was of help.
