Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you find out the total number of triangles in the given figure?

Can you place six X (crosses) in below board without making three in a row in any way ?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What Adam and Eve do not have but the rest of the people have?

Which is the rope you never skip with?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

How can you leave a room with two legs and return with six legs?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?