Question

encontre o vigésimo termo da P A 5,7,8,11....?

por favor me ajude

Answer 1

5,7 -- soma 2 (7-5=2)
7,8 -- soma 1 (8-7=1)
8,11 -- soma 3 (11-8=3)
logo,
5,7,8,11,13,14,17,19,20,23,25,26,29,31,32,35,37,38,41,43

20° termo = 43

Answer 2

an=a1+(n-1)*r

a20=5+(20-1)*2

a20= 5+(19)*2

a20= 5+ 38

a20= 43



R: 0 vigésimo termo é 43