- A42
- B21
- C23
- D19
Step-by-Step Solution
Rule: sticks = . For the first triangle . For 10 triangles: sticks.
Answer: B) 21
Priya makes a triangle pattern with matchsticks joined in a row.
The first triangle uses 3 sticks, and each new triangle joined to it needs 2 more sticks.
Find the number of sticks needed for 10 triangles.
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