Question

A soma dos 30 primeiros números naturais é igual a: ​

Answer 1

Resposta:

eu já fisso

a resposta: 654

Answer 2

$\large\boxed{\begin{array}{l}\sf(0,1,2,3....)\\\sf r=2-1=1 a_{30}=a_1+29r\\\sf a_{30}=0+29\cdot1\\\sf a_{30}=0+29=29\\\sf S_{30}=\dfrac{30\cdot(0+29)}{2}\\\sf S_{30}=15\cdot29\\\sf S_{30}=435\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~d}}}}\end{array}}$