1)15x2=30(колёс)-2х колёсных
2)5x3=15(колёс)
1. Where she plays tonight?
2. Where she lives?
3. Can you play an instrument?
4. This music festival in your town?
5. Do you listen...?
6. What are you doing at the moment?
в 1 коробке к-во коробок всего карандашей
12 штук 4
одинакого
24 ?
третий=1/18
второй=1/6
первый=1/2
S=0.5((1/3)^n)-1)/(1/3 -1)
0.5((1/3)^n -1)/(-2/3)=121/162
-0.75((1/3)^n)=121/162
((1/3)^n -1)=-484/486
(1/3)^n -1=-242/243
(1/3)^n=1/243
n=5
60*0,1=6
60-6=54
..........