In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

What has no start, end, or centre?

I taste better than I can smell. Who am I?

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

What makes this number unique: 8,549,176,320?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

81 x 9 = 801. What must you do to make the this equation true?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

You are on your way to visit your Friend, who lives at the end of the hill. It is his birthday, and you want to give him the cakes you have made. Between your house and his house, you have to cross 5 bridges, and as it goes in the land of make believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake. How many cakes do you have to leave home to make sure that you arrive at a friend's house with exactly two

Spot what is wrong here in below Picture?