Question

Calculati , va rog frumos​

Answer 1

b= 3+8+13+...+10018

b= 3+5•0+3+5•1+3+5•2+...+3+5•2003

b= 5•(0+1+2+...+2003)+3•2004

$b = 0 + 1 + 2 + ... + 2003 \\ b = \frac{2003 \times 2004}{2} \\ b = 2003 \times 1002$

b=5•2003•1002+3•2004

b=10035030+6012

b=10041042