Question

me digam os 20 primeiros elementos dessa sequência 1 6 11 16 e 21 ​

Answer 1

Considerando:

A1=1
R=5

Temos:

an = a1 + (n – 1)r
A1=1+5(1-1) => 1+5(0) => 1+0=1
A2=1+5(2-1) => 1+5(1) => 1+5=6
A3=1+5(3-1) => 1+5(2) => 1+10=11
A4=1+5(4-1) => 1+5(3) => 1+16=17
A5=1+5(5-1) => 1+5(4) => 1+20=21
A6=1+5(6-1) => 1+5(5) => 1+25=26
A7=1+5(7-1) => 1+5(6) => 1+30=31
A8=1+5(8-1) => 1+5(7) => 1+35=36
A9=1+5(9-1) => 1+5(8) => 1+40=41
A10=1+5(10-1) => 1+5(9) => 1+45=46
A11=1+5(11-1) => 1+5(10) => 1+50=51
A12=1+5(12-1) => 1+5(11) => 1+55=56
A13=1+5(13-1) => 1+5(12) => 1+60=61
A14=1+5(14-1) => 1+5(13) => 1+65=66
A15=1+5(15-1) => 1+5(14) => 1+70=71
A16=1+5(16-1) => 1+5(15) => 1+75=76
A17=1+5(17-1) => 1+5(16) => 1+80=81
A18=1+5(18-1) => 1+5(17) => 1+85=86
A19=1+5(19-1) => 1+5(18) => 1+90=91
A20=1+5(20-1) => 1+5(19) => 1+95=96