Question

Which one of the following numbers can be represented as a line, a rectangle and a triangle using dots?

• A. 12
• B. 8
• C. 15
• D. 16

Answer 1

The correct option is C 15

• Every counting number can be represented as a line using dots

• 1 + 2 + 3 + 4 + 5 = 15. So, 15 is a triangular number and hence it can be represented as a triangle using dots.

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• Also, 3 x 5 = 15. So, 15 can also be represented as a rectangle with 3 rows and 5 columns or vice versa.

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• So, among the given options, 15 can be represented as a line, rectangle and triangle using dots.

• Option ‘c’ is the correct option.