Question
Add: $a – b + ab, b – c + bc, c – a + ac.$
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| Children who prefer | School A | School B | School C |
| Walking | 40 | 55 | 15 |
| Cycling | 45 | 25 | 35 |
|
$a$
|
$2$
|
$3$
|
$4$
|
$5$
|
$6$
|
|
$b$
|
$6$
|
$9$
|
$12$
|
$17$
|
$20$
|