Exercise 10.

On the table rest 8 dominoes, as shown below. If you were to line them up in a single row, so that any two sides touching had matching numbers, what would the sum of the two end numbers be?

$A domino with two dots and four dots.$

$A domino with six dots and two dots.$

$A domino with one dot and three dots.$

$A domino with four dots and six dots.$

$A domino with five dots and three dots.$

$A domino with four dots and three dots.$

$A domino with six dots and five dots.$

$A domino with three dots and six dots.$

Hint.