Which of the following is not a triangular number?(a) 1(b) 10(c) 15(d) 20I got this question in an interview.The query is from Properties of Squares in chapter Squares and Square Roots of Mathematics – Class 8

Which of the following is not a triangular number?(a) 1(b) 10(c) 15(d)

1.	Which of the following is not a triangular number?(a) 1(b) 10(c) 15(d) 20I got this question in an interview.The query is from Properties of Squares in chapter Squares and Square Roots of Mathematics – Class 8
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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