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Which of the following is not a triangular number?

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in Mathematics – Class 8 by (91.0k points)
Which of the following is not a triangular number?

(a) 1

(b) 10

(c) 15

(d) 20

I got this question in an interview.

The query is from Properties of Squares in chapter Squares and Square Roots of Mathematics – Class 8

1 Answer

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Best answer
Right option is (d) 20

To elaborate: Triangular numbers are the numbers which when arranged in increasing order forms a shape of triangle. Here the options other than 20 form triangular numbers. Hence the correct option would be 20, since it does not form a triangular number.

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