alleryDots in rows of 1, 2, 3 and 4 make a triangle with how many dots?
A8
B12
C6
D10
Answer & Solution
Correct answer: D. 10
1. A triangular number is a lattice of points arranged in an equilateral triangle.
2. 1 + 2 + 3 + 4 = 10.
3. 6 would be only three rows.
_Source: Wikipedia, Triangular number (CC BY-SA 4.0), Triangular number_
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