CSMC 2021 Part A - Question 1, CEMC UWaterloo

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This problem is tagged with csmc, csmc21, highschool.

(Canadian Senior Mathematics Contest 2021, Part A, Question 1, CEMC - UWaterloo)

In the diagram, a row of $3$ squares is made using $10$ toothpicks. In total, how many toothpicks are needed to make a row of $11$ squares?

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