Solution:

he was genius.

Officials must have thought he was jumping with a hostage, they would never risk giving him a faulty parachute.

Solution:

2/13

There 4 kings & 4 jacks, which implies there are 8 cards that can satisfy the above problem.
=>8/52
=> 2/13

Solution:

2 cakes

At each toll bridge you are required to give half of your cakes, and you receive one back. Which leaves you with 2 cakes after every bridge.

Solution:

1/12

All possible cases can be 36 (6*6)

Case we need : [(4,6), (5,5), (6,4)] = 3

probability => 3/36 = 1/12

Solution:

129.

These are the first 10 prime numbers (2, 3, 5...) prefixed with a 1