Question

dada a progressâo aritmética 4,16,64 determine:
a razao
a18
s18

Answer 1

razão=> q=16/4=4✓
a18 = a1.q^(17) = 4. 4^17 = 4^18✓
s18= 4.(4^18 -1)/4-1 = (4^19 -4)/3 ✓