Question

1: To find the sum of two integers using dominoes​

Answer 1

Answer:

Let2integersarex(x+1)consecutive

⇒x+(x+1)=39

⇒2x+1=39

⇒2x=38

x=19

integerare19and20

Answer 2

Answer:

Hello

Step-by-step explanation:

7 dominoes of the form 0-x (where x≥0 )

6 of the form 1-x (where x≥1 )

5 of the form 2-x (where x≥2 )

4 of the form 3-x (where x≥3 )

3 of the form 4-x (where x≥4 )

2 of the form 5-x (where x≥5 )

1 of the form 6-x (where x≥6 )

So the total number is 7 + 6 + 5 + 4 + 3 + 2 + 1 = 28.