Question

calcula el valor de R
R= 1+4+7+10+...+88​

Answer 1

formula:

$a1+a2+a3+....+a80\\\\formula:\\\frac{a80.a80+1}{2} \\\\reemplazamos:\\\frac{88.89}{2}=3916\\\\\\RPTA: 3916$

corona ^-^