<p>A developer has recently completed a condominium project in HCI Valley. There are five blocks of building A, B, C, D and E as shown in the diagram below.</p>
<figure class="question-figure aligncenter" style="text-align: center;"><img src="https://vocwkpgapvksartxhhor.supabase.co/storage/v1/object/sign/question-images/converted/1759565519539-y882qafzqrc.png?token=eyJraWQiOiJiZTM3ZjNhZS05OWM4LTQ5ZGQtYjRiNS1iMTBhYmJhNjY5MWYiLCJhbGciOiJIUzI1NiJ9.eyJ1cmwiOiJxdWVzdGlvbi1pbWFnZXMvY29udmVydGVkLzE3NTk1NjU1MTk1MzkteTg4MnFhZnpxcmMucG5nIiwic2NvcGUiOiJkb3dubG9hZCIsImlhdCI6MTc5MzUzOTM5MiwiZXhwIjoxNzkzNTM5NjkyfQ.OTkiaeXi_xXusZb3TWtVKHEjH3cRoSm4wMGSUPHPF6k" width="400" class="aligncenter" /></figure>
<p>The developer has four colours available to paint the buildings. Each block can only be painted using a single colour. Find the number of ways to paint all the five blocks if</p>
<ol class="i-list"><li><div class="list-item-content"><span class="list-item-text">there are no restrictions,</span></div><p style="text-align: right;">[1]</p></li><li><div class="list-item-content"><span class="list-item-text">block A and block B cannot be painted with the same colour,</span></div><p style="text-align: right;">[2]</p></li><li><div class="list-item-content"><span class="list-item-text">all four colours must be used.</span></div><p style="text-align: right;">[2]</p></li></ol>

A developer has recently completed a condominium project in HCI Valley. There are five blocks of building A, B, C, D and E as shown in the diagram below.

The developer has four colours available to paint the buildings. Each block can only be painted using a single colour. Find the number of ways to paint all the five blocks if

2011 HCI P2 Q6

2011 HCI P2 Q6

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