What does the below image rebus riddle means ?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Count the number of triangles in the given picture.

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

What is the fastest way to double your money?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?