I will hope this helps :p
Answer And explanation
a)
has 1/ probability guess the correct source
b)
Each element in is mapped by / . There are So there are -1 elements.
number of target elements =
number of source elements = -1
probability = -1 /
c) Probability of the correct target element
1/
Answer:
maybe blockchain can help them in term of security
I'm pretty sure it's the frontal lobe