Question 21
The map below shows 28 postal districts of Singapore. Each district is to be
painted with one colour. What is the least number of colours needed to paint all
the regions so that any two neighbouring districts do not share the same colour?
Sees eee (Md Sastre, SSE SSsoessca— fSoiseenaaanoeten + : Sanco
;
St
= SS SS eee eS eS eee
painted with one colour. What is the least number of colours needed to paint all
the regions so that any two neighbouring districts do not share the same colour?
Sees eee (Md Sastre, SSE SSsoessca— fSoiseenaaanoeten + : Sanco
;
St
= SS SS eee eS eS eee