Adding Triangular Numbers

Q.

Find the value of
(1 + 3 + 5 + 7 + 9 + 11 + 13 + 15).

1. 25

2. 36

3. 49

4. 64

Q.

Which of the following represents a circle of triangular numbers?

1. 

2. 

3. 

4. 

Q.

The sum of any two consecutive natural numbers is a perfect square.

1. a)Yes

2. a)No

Q.

The sum of two consecutive triangular numbers gives a __ number.

Q.

Without adding, find the sum of 1 + 3 + 5 + 7 + 9.

1. 36

2. 25

3. 16

4. 9

Q. The sum of the first n consecutive natural numbers is a number.

1. negative
2. square
3. triangular
4. cubic

Q. 10 is a triangular number.

1. False
2. True

Q. The sum of two consecutive triangular numbers is a square number.

1. True
2. False

Q. In the following sequence of triangular numbers, how many dots will be present in the 5th (next) triangle?

1. 14
2. 16
3. 12
4. 15

Q. Which of the following triangles represent a collection of triangular numbers?

1. A
2. B
3. C
4. D