Triangular numbers | Triangular number pattern

Triangular numbers is an important topic for maths. Triangular numbers and triangular pattern, triangular number sequence, triangular numbers 1 to 100 are must to learn in this chapter.
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[SabnamAltaf-yi]

15 mam thanks for teaching me and others you are very helpful women

[nimruthi]

Exercise 1answer is 21 is that correct

[madhudua]

Exercise 1 pentagnal and haxagnal number

[Boldgirlful]

Very helpful ❤ thank you for this informational video

[AzeezuddinSarfaraz]

In the first question 5th triangular number is 15
In the second last question 5th triangular number is 21 If the question is same...pls clarify

[abhijeetjadhav]

Exercise 2. 1 square number and triangular number.