SASMO 2016 Secondary 1 (Grade 7) Contest Question 11

i There are 11 regions in the diagram on the right. Each region
is to be painted with one colour. What is the least number of
= colours needed to paint all the regions so that any two
i / adjacent regions do not share the same colour?
A. 3
sl B. 4

=| GS
iS D. 6
i E. None of the above

. =