Missing Numbers in the Pattern

Q.

Observe the dot pattern arranged in triangles. How many dots will be there in the next triangle?

1. 8

2. 9

3. 10

4. 11

Q. What is the next number in this sequence - 5, 25, 125...?

1. 625
2. 250
3. 1, 250
4. 500

Q.

Observe the dot arranged in the triangle. How many dots will be there in the 6th triangle of series?

1. 19

2. 21

3. 18

4. 23

Q. Any perfect square (except 1) can be expressed as the sum of two consecutive ________ numbers.

1. odd
2. even
3. prime
4. triangular

Q. Which of the following is a triangular number?

1. 4
2. 7
3. 8
4. 10