[Pattern] Solve this Figure Pattern within 5 minutes! | #2

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This may seem like a daunting question where the numbers need to be calculated manually. Nope. Let me show you how it's done.

To understand how the formula was derived, check out this video:

Question Source: ACS P6 2017 SA1 Q18

Presenter: Kevin Huang Zhenhui
Curriculum Specialist, Maths Heuristics P/L
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thank you- i just finished my math homework

cammiegoh
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What is the pattern number if 275 black dots are used?

NoName-qhrv