What does this mathematical rebus means ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you fill the blank with the correct number?

6 30 870 756030 _____

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

I am white when I am dirty, and black when I am clean. What am I?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

What does this rebus mean?

O
N
C
E
TIME

O_er_t_o_

Complete the missing letters of the given word.

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.