What is the next triangular number after 1, 3, 6, 10, 15, ...?

Type: MCQ • Marks: 1

A. 20

B. 18

C. 21

D. 25

Explanation

Triangular numbers add +2, +3, +4, +5, +6. Next is 15 + 6 = 21.

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Class 7th Ganita Prakash 1

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