Answer:

Step-by-step explanation:
From the Venn diagram, n(AUB)=31
The given probabilities in the option are calculated below:

The only correct option is the probability of B which is 
The half-life of the radioactive substance is 67.95 hours.
Answer:16
Step-by-step explanation:
Answer:
8
Step-by-step explanation:
ab = 2 * 4 = 8
Answer:
6.5x10^7
Step-by-step explanation: