Question

afla suma resturilor împărțirii lor tuturor numerelor naturale x la numarul 3 unde 10<x si x mai mic sau egal ca 20

Answer 1

x=11=>11:3=3 rest 2
x=12=>12:3=4 rest 0
x=13=>13:3=4 rest 1
x=14=>14:3=4 rest 2
x=15=>15:3=5 rest 0
x=16=>16:3=5 rest 1
x=17=>17:3=5 rest 2
x=18=>18:3=6 rest 0
x=19=>19:3=6 rest 1
x=20=>20:3=6 rest 2
2+0+1+2+0+1+2+0+1+2=11

Answer 2

10<x<20
x=11,12,13,14,15,16,17,18,19
avem
11:3=3 rest 2
12:3=4
13:3=4 rest 1
14:3=4 rest 2
15:3=5
16:3=5 rest 1
17:3=5 rest 2
18:3=6
19:3=6 rest 1
suma resturilor e:
2+1+2+1+2+1=9