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6 dots can be arranged as a triangle and also as a rectangle with at least 2 rows and 2 columns. Which number on the cards can also be arranged in BOTH ways?

Class 6Patterns in Whole NumbersWhole Numbers
  • A3
  • B8
  • C13
  • D21

Step-by-Step Solution

Triangular numbers are 1, 3, 6, 10, 15, 21, 28, … so 3 and 21 make triangles. 3 dots can only make a single line, not a rectangle, but makes a rectangle too. 8 is but not triangular; 13 makes neither.
Answer: D) 21

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