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Question

What is the rule that gives the number of matchsticks in terms of the number of triangles, as shown in the figures below?


A
4x+1
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B
3x+1
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C
2x+1
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D
2x
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Solution

The correct option is C 2x+1


The column of 'number of matchsticks - 1' forms the multiplication table of 2, i.e., 2, 4, 6, 8, ...

Let the number of triangles be x.

The number of matchsticks used in each pattern is 1 more than 2 times the number of triangles in it.

The number of matchsticks used in each pattern = 2x+1


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