- A21
- B36
- C28
- D49
Step-by-Step Solution
The rows are 1, 2, 3, …, so the 7th triangle has dots. (21 is the 6th triangle; 49 is the 7th SQUARE number.)
Answer: C) 28
The dot triangles show the 1st, 2nd, 3rd and 4th triangular numbers. Each new triangle adds one more row. How many dots will the 7th triangle have?
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