Question

determine o numero de termos da p.a. finita (4,8,12,...,104)

Answer 1

p.a. (4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104)
numero de termos=26

Answer 2

An=a1+(n-1)×r
104=4+(n-1)×4
104=4+4n-4
4n=104
n=104÷4
n=26