What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

Find the next number in the following series:
6, 14, 26, 98, __?

What is the coolest letter in the alphabet?

Which wheel of car does not rotate when you turn your car right?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.