1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20 eching

$$1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20$$

Baholash

$$210$$

Yechim qadamlari

3 olish uchun 1 va 2'ni qo'shing.

$$3+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20$$

6 olish uchun 3 va 3'ni qo'shing.

$$6+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20$$

10 olish uchun 6 va 4'ni qo'shing.

$$10+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20$$

15 olish uchun 10 va 5'ni qo'shing.

$$15+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20$$

21 olish uchun 15 va 6'ni qo'shing.

$$21+7+8+9+10+11+12+13+14+15+16+17+18+19+20$$

28 olish uchun 21 va 7'ni qo'shing.

$$28+8+9+10+11+12+13+14+15+16+17+18+19+20$$

36 olish uchun 28 va 8'ni qo'shing.

$$36+9+10+11+12+13+14+15+16+17+18+19+20$$

45 olish uchun 36 va 9'ni qo'shing.

$$45+10+11+12+13+14+15+16+17+18+19+20$$

55 olish uchun 45 va 10'ni qo'shing.

$$55+11+12+13+14+15+16+17+18+19+20$$

66 olish uchun 55 va 11'ni qo'shing.

$$66+12+13+14+15+16+17+18+19+20$$

78 olish uchun 66 va 12'ni qo'shing.

$$78+13+14+15+16+17+18+19+20$$

91 olish uchun 78 va 13'ni qo'shing.

$$91+14+15+16+17+18+19+20$$

105 olish uchun 91 va 14'ni qo'shing.

$$105+15+16+17+18+19+20$$

120 olish uchun 105 va 15'ni qo'shing.

$$120+16+17+18+19+20$$

136 olish uchun 120 va 16'ni qo'shing.

$$136+17+18+19+20$$

153 olish uchun 136 va 17'ni qo'shing.

$$153+18+19+20$$

171 olish uchun 153 va 18'ni qo'shing.

$$171+19+20$$

190 olish uchun 171 va 19'ni qo'shing.

$$190+20$$

210 olish uchun 190 va 20'ni qo'shing.

$$210$$

Omil

$$2\times 3\times 5\times 7$$